diff --git a/android/src/toga_android/factory.py b/android/src/toga_android/factory.py
index 8b14f6ba3f..fae84635a8 100644
--- a/android/src/toga_android/factory.py
+++ b/android/src/toga_android/factory.py
@@ -1,86 +1,62 @@
-from toga import NotImplementedWarning
+import importlib
 
-from . import dialogs
-from .app import App, MainWindow
-from .command import Command
-from .fonts import Font
-from .hardware.camera import Camera
-from .hardware.location import Location
-from .icons import Icon
-from .images import Image
-from .paths import Paths
-from .widgets.box import Box
-from .widgets.button import Button
-from .widgets.canvas import Canvas
-from .widgets.dateinput import DateInput
-from .widgets.detailedlist import DetailedList
-from .widgets.divider import Divider
-from .widgets.imageview import ImageView
-from .widgets.label import Label
-from .widgets.mapview import MapView
-from .widgets.multilinetextinput import MultilineTextInput
-from .widgets.numberinput import NumberInput
-from .widgets.optioncontainer import OptionContainer
-from .widgets.passwordinput import PasswordInput
-from .widgets.progressbar import ProgressBar
-from .widgets.scrollcontainer import ScrollContainer
-from .widgets.selection import Selection
-from .widgets.slider import Slider
-from .widgets.switch import Switch
-from .widgets.table import Table
-from .widgets.textinput import TextInput
-from .widgets.timeinput import TimeInput
-from .widgets.webview import WebView
-from .window import Window
+from toga import NotImplementedWarning
 
+toga_android_factory_imports = {
+    "App": "toga_android.app",
+    "MainWindow": "toga_android.app",
+    "Command": "toga_android.command",
+    "Camera": "toga_android.hardware.camera",
+    "Font": "toga_android.fonts",
+    "Icon": "toga_android.icons",
+    "Image": "toga_android.images",
+    "Paths": "toga_android.paths",
+    "Box": "toga_android.widgets.box",
+    "Button": "toga_android.widgets.button",
+    "Canvas": "toga_android.widgets.canvas",
+    "DateInput": "toga_android.widgets.dateinput",
+    "DetailedList": "toga_android.widgets.detailedlist",
+    "Divider": "toga_android.widgets.divider",
+    "dialogs": "toga_android",
+    "ImageView": "toga_android.widgets.imageview",
+    "Label": "toga_android.widgets.label",
+    "Location": "toga_android.hardware.location",
+    "MapView": "toga_android.widgets.mapview",
+    "MultilineTextInput": "toga_android.widgets.multilinetextinput",
+    "NumberInput": "toga_android.widgets.numberinput",
+    "OptionContainer": "toga_android.widgets.optioncontainer",
+    "PasswordInput": "toga_android.widgets.passwordinput",
+    "ProgressBar": "toga_android.widgets.progressbar",
+    "ScrollContainer": "toga_android.widgets.scrollcontainer",
+    "Selection": "toga_android.widgets.selection",
+    "Slider": "toga_android.widgets.slider",
+    "Switch": "toga_android.widgets.switch",
+    "Table": "toga_android.widgets.table",
+    "TextInput": "toga_android.widgets.textinput",
+    "TimeInput": "toga_android.widgets.timeinput",
+    "WebView": "toga_android.widgets.webview",
+    "Window": "toga_android.window",
+}
+__all__ = list(toga_android_factory_imports.keys()) + ["not_implemented"]
 
-def not_implemented(feature):
-    NotImplementedWarning.warn("Android", feature)
 
+def __getattr__(name):
+    try:
+        module_name = toga_android_factory_imports[name]
 
-__all__ = [
-    "App",
-    "Command",
-    "MainWindow",
-    "not_implemented",
-    # Resources
-    "dialogs",
-    "Font",
-    "Icon",
-    "Image",
-    "Paths",
-    # Hardware
-    "Camera",
-    "Location",
-    # Widgets
-    # ActivityIndicator
-    "Box",
-    "Button",
-    "Canvas",
-    "DateInput",
-    "DetailedList",
-    "Divider",
-    "ImageView",
-    "Label",
-    "MapView",
-    "MultilineTextInput",
-    "NumberInput",
-    "OptionContainer",
-    "PasswordInput",
-    "ProgressBar",
-    "ScrollContainer",
-    # "SplitContainer",
-    "Selection",
-    "Slider",
-    "Switch",
-    "Table",
-    "TextInput",
-    "TimeInput",
-    # "Tree",
-    "WebView",
-    "Window",
-]
+        has_dot = module_name.find(".") != -1
+        if not has_dot:
+            module_name = f"toga_android.{name}"
+    except KeyError:
+        raise NotImplementedError(
+            f"Toga's Android backend doesn't implement '{name}'"
+        ) from None
+    else:
+        module = importlib.import_module(module_name)
+        value = getattr(module, name) if has_dot else module
+        globals()[name] = value
+        return value
 
 
-def __getattr__(name):  # pragma: no cover
-    raise NotImplementedError(f"Toga's Android backend doesn't implement {name}")
+def not_implemented(feature):
+    NotImplementedWarning.warn("Android", feature)
diff --git a/android/src/toga_android/widgets/slider.py b/android/src/toga_android/widgets/slider.py
index 12a263b152..d0c5988931 100644
--- a/android/src/toga_android/widgets/slider.py
+++ b/android/src/toga_android/widgets/slider.py
@@ -5,7 +5,7 @@
 from android.widget import SeekBar
 from java import dynamic_proxy
 
-import toga
+from toga.widgets.slider import IntSliderImpl
 
 from .base import Widget
 
@@ -31,7 +31,7 @@ def onStopTrackingTouch(self, native_seekbar):
         self.impl.interface.on_release()
 
 
-class Slider(Widget, toga.widgets.slider.IntSliderImpl):
+class Slider(Widget, IntSliderImpl):
     focusable = False
     TICK_DRAWABLE = None
 
diff --git a/changes/2547.feature.rst b/changes/2547.feature.rst
new file mode 100644
index 0000000000..b3b2b33cea
--- /dev/null
+++ b/changes/2547.feature.rst
@@ -0,0 +1 @@
+Imports from the ``toga`` namespace and the backend factories have been modified to use lazy importing.
diff --git a/cocoa/src/toga_cocoa/documents.py b/cocoa/src/toga_cocoa/documents.py
index efa7b91092..62a57e2129 100644
--- a/cocoa/src/toga_cocoa/documents.py
+++ b/cocoa/src/toga_cocoa/documents.py
@@ -1,3 +1,4 @@
+# pragma: no cover
 import os
 from urllib.parse import quote
 
diff --git a/cocoa/src/toga_cocoa/factory.py b/cocoa/src/toga_cocoa/factory.py
index 981a384dc7..de2394bd53 100644
--- a/cocoa/src/toga_cocoa/factory.py
+++ b/cocoa/src/toga_cocoa/factory.py
@@ -1,90 +1,67 @@
-from toga import NotImplementedWarning
+import importlib
 
-from . import dialogs
-from .app import App, DocumentApp, MainWindow
-from .command import Command
-from .documents import Document
-from .fonts import Font
-from .hardware.camera import Camera
-from .hardware.location import Location
-from .icons import Icon
-from .images import Image
-from .paths import Paths
+from toga import NotImplementedWarning
 
-# Widgets
-from .widgets.activityindicator import ActivityIndicator
-from .widgets.box import Box
-from .widgets.button import Button
-from .widgets.canvas import Canvas
-from .widgets.detailedlist import DetailedList
-from .widgets.divider import Divider
-from .widgets.imageview import ImageView
-from .widgets.label import Label
-from .widgets.mapview import MapView
-from .widgets.multilinetextinput import MultilineTextInput
-from .widgets.numberinput import NumberInput
-from .widgets.optioncontainer import OptionContainer
-from .widgets.passwordinput import PasswordInput
-from .widgets.progressbar import ProgressBar
-from .widgets.scrollcontainer import ScrollContainer
-from .widgets.selection import Selection
-from .widgets.slider import Slider
-from .widgets.splitcontainer import SplitContainer
-from .widgets.switch import Switch
-from .widgets.table import Table
-from .widgets.textinput import TextInput
-from .widgets.tree import Tree
-from .widgets.webview import WebView
-from .window import Window
+toga_cocoa_factory_imports = {
+    "App": "toga_cocoa.app",
+    "DocumentApp": "toga_cocoa.app",
+    "DocumentMainWindow": "toga_cocoa.app",
+    "Command": "toga_cocoa.command",
+    "Document": "toga_cocoa.documents",
+    "dialogs": "toga_cocoa",
+    "Font": "toga_cocoa.fonts",
+    "Camera": "toga_cocoa.hardware.camera",
+    "Location": "toga_cocoa.hardware.location",
+    "Icon": "toga_cocoa.icons",
+    "Image": "toga_cocoa.images",
+    "Paths": "toga_cocoa.paths",
+    "ActivityIndicator": "toga_cocoa.widgets.activityindicator",
+    "Box": "toga_cocoa.widgets.box",
+    "Button": "toga_cocoa.widgets.button",
+    "Canvas": "toga_cocoa.widgets.canvas",
+    "DetailedList": "toga_cocoa.widgets.detailedlist",
+    "Divider": "toga_cocoa.widgets.divider",
+    "ImageView": "toga_cocoa.widgets.imageview",
+    "Label": "toga_cocoa.widgets.label",
+    "MapView": "toga_cocoa.widgets.mapview",
+    "MainWindow": "toga_cocoa.app",
+    "MultilineTextInput": "toga_cocoa.widgets.multilinetextinput",
+    "NumberInput": "toga_cocoa.widgets.numberinput",
+    "OptionContainer": "toga_cocoa.widgets.optioncontainer",
+    "PasswordInput": "toga_cocoa.widgets.passwordinput",
+    "ProgressBar": "toga_cocoa.widgets.progressbar",
+    "ScrollContainer": "toga_cocoa.widgets.scrollcontainer",
+    "Selection": "toga_cocoa.widgets.selection",
+    "Slider": "toga_cocoa.widgets.slider",
+    "SplitContainer": "toga_cocoa.widgets.splitcontainer",
+    "Switch": "toga_cocoa.widgets.switch",
+    "Table": "toga_cocoa.widgets.table",
+    "TextInput": "toga_cocoa.widgets.textinput",
+    "Tree": "toga_cocoa.widgets.tree",
+    "WebView": "toga_cocoa.widgets.webview",
+    "Window": "toga_cocoa.window",
+}
 
+__all__ = list(toga_cocoa_factory_imports.keys()) + ["not_implemented"]
 
-def not_implemented(feature):
-    NotImplementedWarning.warn("Cocoa", feature)
 
+def __getattr__(name):
+    try:
+        module_name = toga_cocoa_factory_imports[name]
 
-__all__ = [
-    "not_implemented",
-    "App",
-    "DocumentApp",
-    "MainWindow",
-    "Command",
-    "Document",
-    # Resources
-    "Font",
-    "Icon",
-    "Image",
-    "Paths",
-    "dialogs",
-    # Hardware
-    "Camera",
-    "Location",
-    # Widgets
-    "ActivityIndicator",
-    "Box",
-    "Button",
-    "Canvas",
-    "DetailedList",
-    "Divider",
-    "ImageView",
-    "Label",
-    "MapView",
-    "MultilineTextInput",
-    "NumberInput",
-    "OptionContainer",
-    "PasswordInput",
-    "ProgressBar",
-    "ScrollContainer",
-    "Selection",
-    "Slider",
-    "SplitContainer",
-    "Switch",
-    "Table",
-    "TextInput",
-    "Tree",
-    "WebView",
-    "Window",
-]
+        has_dot = module_name.find(".") != -1
+        if not has_dot:
+            module_name = f"toga_cocoa.{name}"
+    except KeyError:
+        raise NotImplementedError(
+            f"Toga's Cocoa backend doesn't implement '{name}'"
+        ) from None
+    else:
+        module = importlib.import_module(module_name)
+        value = getattr(module, name) if has_dot else module
+        globals()[name] = value
+        return value
 
 
-def __getattr__(name):  # pragma: no cover
-    raise NotImplementedError(f"Toga's Cocoa backend doesn't implement {name}")
+def not_implemented(feature):
+    NotImplementedWarning.warn("Cocoa", feature)
diff --git a/core/src/toga/__init__.py b/core/src/toga/__init__.py
index a6fc276daf..5aeed8e6ca 100644
--- a/core/src/toga/__init__.py
+++ b/core/src/toga/__init__.py
@@ -1,47 +1,72 @@
+from __future__ import annotations
+
+import importlib
+import importlib.util
 import warnings
 
-from .app import App, DocumentApp, DocumentMainWindow, MainWindow
+toga_core_imports = {
+    "App": "toga.app",
+    "DocumentApp": "toga.app",
+    "DocumentMainWindow": "toga.app",
+    "MainWindow": "toga.app",
+    "hsl": "toga.colors",
+    "hsla": "toga.colors",
+    "rgb": "toga.colors",
+    "rgba": "toga.colors",
+    "Command": "toga.command",
+    "Group": "toga.command",
+    "Document": "toga.documents",
+    "Font": "toga.fonts",
+    "Icon": "toga.icons",
+    "Image": "toga.images",
+    "Key": "toga.keys",
+    "LatLng": "toga.types",
+    "ActivityIndicator": "toga.widgets.activityindicator",
+    "Widget": "toga.widgets.base",
+    "Box": "toga.widgets.box",
+    "Button": "toga.widgets.button",
+    "Canvas": "toga.widgets.canvas",
+    "DateInput": "toga.widgets.dateinput",
+    "DatePicker": "toga.widgets.dateinput",
+    "DetailedList": "toga.widgets.detailedlist",
+    "Divider": "toga.widgets.divider",
+    "ImageView": "toga.widgets.imageview",
+    "Label": "toga.widgets.label",
+    "MapPin": "toga.widgets.mapview",
+    "MapView": "toga.widgets.mapview",
+    "MultilineTextInput": "toga.widgets.multilinetextinput",
+    "NumberInput": "toga.widgets.numberinput",
+    "OptionContainer": "toga.widgets.optioncontainer",
+    "OptionItem": "toga.widgets.optioncontainer",
+    "PasswordInput": "toga.widgets.passwordinput",
+    "ProgressBar": "toga.widgets.progressbar",
+    "ScrollContainer": "toga.widgets.scrollcontainer",
+    "Selection": "toga.widgets.selection",
+    "Slider": "toga.widgets.slider",
+    "SplitContainer": "toga.widgets.splitcontainer",
+    "Switch": "toga.widgets.switch",
+    "Table": "toga.widgets.table",
+    "TextInput": "toga.widgets.textinput",
+    "TimeInput": "toga.widgets.timeinput",
+    "TimePicker": "toga.widgets.timeinput",
+    "Tree": "toga.widgets.tree",
+    "WebView": "toga.widgets.webview",
+    "Window": "toga.window",
+}
 
-# Resources
-from .colors import hsl, hsla, rgb, rgba
-from .command import Command, Group
-from .documents import Document
-from .fonts import Font
-from .icons import Icon
-from .images import Image
-from .keys import Key
+__all__ = list(toga_core_imports.keys())
 
-# Types
-from .types import LatLng
 
-# Widgets
-from .widgets.activityindicator import ActivityIndicator
-from .widgets.base import Widget
-from .widgets.box import Box
-from .widgets.button import Button
-from .widgets.canvas import Canvas
-from .widgets.dateinput import DateInput, DatePicker
-from .widgets.detailedlist import DetailedList
-from .widgets.divider import Divider
-from .widgets.imageview import ImageView
-from .widgets.label import Label
-from .widgets.mapview import MapPin, MapView
-from .widgets.multilinetextinput import MultilineTextInput
-from .widgets.numberinput import NumberInput
-from .widgets.optioncontainer import OptionContainer, OptionItem
-from .widgets.passwordinput import PasswordInput
-from .widgets.progressbar import ProgressBar
-from .widgets.scrollcontainer import ScrollContainer
-from .widgets.selection import Selection
-from .widgets.slider import Slider
-from .widgets.splitcontainer import SplitContainer
-from .widgets.switch import Switch
-from .widgets.table import Table
-from .widgets.textinput import TextInput
-from .widgets.timeinput import TimeInput, TimePicker
-from .widgets.tree import Tree
-from .widgets.webview import WebView
-from .window import Window
+def __getattr__(name):
+    try:
+        module_name = toga_core_imports[name]
+    except KeyError:
+        raise AttributeError(f"module '{__name__}' has no attribute '{name}'") from None
+    else:
+        module = importlib.import_module(module_name)
+        value = getattr(module, name)
+        globals()[name] = value
+        return value
 
 
 class NotImplementedWarning(RuntimeWarning):
@@ -54,66 +79,6 @@ def warn(self, platform, feature):
         warnings.warn(NotImplementedWarning(f"[{platform}] Not implemented: {feature}"))
 
 
-__all__ = [
-    "NotImplementedWarning",
-    # Applications
-    "App",
-    "DocumentApp",
-    "MainWindow",
-    "DocumentMainWindow",
-    # Commands
-    "Command",
-    "Group",
-    # Documents
-    "Document",
-    # Keys
-    "Key",
-    # Resources
-    "hsl",
-    "hsla",
-    "rgb",
-    "rgba",
-    "Font",
-    "Icon",
-    "Image",
-    # Types
-    "LatLng",
-    # Widgets
-    "ActivityIndicator",
-    "Box",
-    "Button",
-    "Canvas",
-    "DateInput",
-    "DetailedList",
-    "Divider",
-    "ImageView",
-    "Label",
-    "MapPin",
-    "MapView",
-    "MultilineTextInput",
-    "NumberInput",
-    "OptionContainer",
-    "OptionItem",
-    "PasswordInput",
-    "ProgressBar",
-    "ScrollContainer",
-    "Selection",
-    "Slider",
-    "SplitContainer",
-    "Switch",
-    "Table",
-    "TextInput",
-    "TimeInput",
-    "Tree",
-    "WebView",
-    "Widget",
-    "Window",
-    # Deprecated widget names
-    "DatePicker",
-    "TimePicker",
-]
-
-
 def _package_version(file, name):
     try:
         # Read version from SCM metadata
diff --git a/dummy/src/toga_dummy/widgets/slider.py b/dummy/src/toga_dummy/widgets/slider.py
index 31c2a4137a..e3ea59a3e0 100644
--- a/dummy/src/toga_dummy/widgets/slider.py
+++ b/dummy/src/toga_dummy/widgets/slider.py
@@ -1,9 +1,9 @@
-import toga
+from toga.widgets.slider import SliderImpl
 
 from .base import Widget
 
 
-class Slider(Widget, toga.widgets.slider.SliderImpl):
+class Slider(Widget, SliderImpl):
     def create(self):
         self._action("create Slider")
 
diff --git a/gtk/src/toga_gtk/factory.py b/gtk/src/toga_gtk/factory.py
index a0d48f0af1..efaf7b4855 100644
--- a/gtk/src/toga_gtk/factory.py
+++ b/gtk/src/toga_gtk/factory.py
@@ -1,83 +1,67 @@
+import importlib
+
 from toga import NotImplementedWarning
 
-from . import dialogs
-from .app import App, DocumentApp, MainWindow
-from .command import Command
-from .documents import Document
-from .fonts import Font
-from .icons import Icon
-from .images import Image
-from .paths import Paths
-from .widgets.activityindicator import ActivityIndicator
-from .widgets.box import Box
-from .widgets.button import Button
-from .widgets.canvas import Canvas
-from .widgets.detailedlist import DetailedList
-from .widgets.divider import Divider
-from .widgets.imageview import ImageView
-from .widgets.label import Label
-from .widgets.mapview import MapView
-from .widgets.multilinetextinput import MultilineTextInput
-from .widgets.numberinput import NumberInput
-from .widgets.optioncontainer import OptionContainer
-from .widgets.passwordinput import PasswordInput
-from .widgets.progressbar import ProgressBar
-from .widgets.scrollcontainer import ScrollContainer
-from .widgets.selection import Selection
-from .widgets.slider import Slider
-from .widgets.splitcontainer import SplitContainer
-from .widgets.switch import Switch
-from .widgets.table import Table
-from .widgets.textinput import TextInput
-from .widgets.tree import Tree
-from .widgets.webview import WebView
-from .window import Window
+toga_gtk_factory_imports = {
+    "App": "toga_gtk.app",
+    "DocumentApp": "toga_gtk.app",
+    "DocumentMainWindow": "toga_gtk.app",
+    "Command": "toga_gtk.command",
+    "Document": "toga_gtk.documents",
+    "dialogs": "toga_gtk",
+    "Font": "toga_gtk.fonts",
+    "Camera": "toga_gtk.hardware.camera",
+    "Location": "toga_gtk.hardware.location",
+    "Icon": "toga_gtk.icons",
+    "Image": "toga_gtk.images",
+    "Paths": "toga_gtk.paths",
+    "ActivityIndicator": "toga_gtk.widgets.activityindicator",
+    "Box": "toga_gtk.widgets.box",
+    "Button": "toga_gtk.widgets.button",
+    "Canvas": "toga_gtk.widgets.canvas",
+    "DetailedList": "toga_gtk.widgets.detailedlist",
+    "Divider": "toga_gtk.widgets.divider",
+    "ImageView": "toga_gtk.widgets.imageview",
+    "Label": "toga_gtk.widgets.label",
+    "MapView": "toga_gtk.widgets.mapview",
+    "MainWindow": "toga_gtk.app",
+    "MultilineTextInput": "toga_gtk.widgets.multilinetextinput",
+    "NumberInput": "toga_gtk.widgets.numberinput",
+    "OptionContainer": "toga_gtk.widgets.optioncontainer",
+    "PasswordInput": "toga_gtk.widgets.passwordinput",
+    "ProgressBar": "toga_gtk.widgets.progressbar",
+    "ScrollContainer": "toga_gtk.widgets.scrollcontainer",
+    "Selection": "toga_gtk.widgets.selection",
+    "Slider": "toga_gtk.widgets.slider",
+    "SplitContainer": "toga_gtk.widgets.splitcontainer",
+    "Switch": "toga_gtk.widgets.switch",
+    "Table": "toga_gtk.widgets.table",
+    "TextInput": "toga_gtk.widgets.textinput",
+    "Tree": "toga_gtk.widgets.tree",
+    "WebView": "toga_gtk.widgets.webview",
+    "Window": "toga_gtk.window",
+}
 
+__all__ = list(toga_gtk_factory_imports.keys()) + ["not_implemented"]
 
-def not_implemented(feature):
-    NotImplementedWarning.warn("GTK", feature)
 
+def __getattr__(name):
+    try:
+        module_name = toga_gtk_factory_imports[name]
 
-__all__ = [
-    "not_implemented",
-    "App",
-    "DocumentApp",
-    "MainWindow",
-    "Command",
-    "Document",
-    # Resources
-    "Font",
-    "Icon",
-    "Image",
-    "Paths",
-    "dialogs",
-    # Widgets
-    "ActivityIndicator",
-    "Box",
-    "Button",
-    "Canvas",
-    "DetailedList",
-    "Divider",
-    "ImageView",
-    "Label",
-    "MapView",
-    "MultilineTextInput",
-    "NumberInput",
-    "OptionContainer",
-    "PasswordInput",
-    "ProgressBar",
-    "ScrollContainer",
-    "Selection",
-    "Slider",
-    "SplitContainer",
-    "Switch",
-    "Table",
-    "TextInput",
-    "Tree",
-    "WebView",
-    "Window",
-]
+        has_dot = module_name.find(".") != -1
+        if not has_dot:
+            module_name = f"toga_gtk.{name}"
+    except KeyError:
+        raise NotImplementedError(
+            f"Toga's GTK backend doesn't implement '{name}'"
+        ) from None
+    else:
+        module = importlib.import_module(module_name)
+        value = getattr(module, name) if has_dot else module
+        globals()[name] = value
+        return value
 
 
-def __getattr__(name):  # pragma: no cover
-    raise NotImplementedError(f"Toga's GTK backend doesn't implement {name}")
+def not_implemented(feature):
+    NotImplementedWarning.warn("GTK", feature)
diff --git a/gtk/src/toga_gtk/widgets/slider.py b/gtk/src/toga_gtk/widgets/slider.py
index 301cbfa356..f5d4766372 100644
--- a/gtk/src/toga_gtk/widgets/slider.py
+++ b/gtk/src/toga_gtk/widgets/slider.py
@@ -1,6 +1,6 @@
 from travertino.size import at_least
 
-import toga
+from toga.widgets.slider import SliderImpl
 
 from ..libs import Gtk
 from .base import Widget
@@ -16,7 +16,7 @@
 # to line up at the same values.
 
 
-class Slider(Widget, toga.widgets.slider.SliderImpl):
+class Slider(Widget, SliderImpl):
     def create(self):
         self.adj = Gtk.Adjustment()
         self.native = Gtk.Scale.new(Gtk.Orientation.HORIZONTAL, self.adj)
diff --git a/iOS/src/toga_iOS/factory.py b/iOS/src/toga_iOS/factory.py
index 2c7088d206..98dcde3f70 100644
--- a/iOS/src/toga_iOS/factory.py
+++ b/iOS/src/toga_iOS/factory.py
@@ -1,88 +1,61 @@
-from toga import NotImplementedWarning
-
-from . import dialogs
-from .app import App, MainWindow
-from .colors import native_color
-from .command import Command
-from .fonts import Font
-from .hardware.camera import Camera
-from .hardware.location import Location
-from .icons import Icon
-from .images import Image
-from .paths import Paths
-
-# Widgets
-from .widgets.box import Box
-from .widgets.button import Button
-from .widgets.canvas import Canvas
-from .widgets.detailedlist import DetailedList
-from .widgets.imageview import ImageView
-from .widgets.label import Label
-from .widgets.mapview import MapView
-from .widgets.multilinetextinput import MultilineTextInput
-from .widgets.numberinput import NumberInput
-from .widgets.optioncontainer import OptionContainer
-from .widgets.passwordinput import PasswordInput
-from .widgets.progressbar import ProgressBar
-from .widgets.scrollcontainer import ScrollContainer
-from .widgets.selection import Selection
-from .widgets.slider import Slider
+import importlib
 
-# from .widgets.splitcontainer import SplitContainer
-from .widgets.switch import Switch
-
-# from .widgets.table import Table
-from .widgets.textinput import TextInput
+from toga import NotImplementedWarning
 
-# from .widgets.tree import Tree
-from .widgets.webview import WebView
-from .window import Window
+toga_ios_factory_imports = {
+    "App": "toga_iOS.app",
+    "MainWindow": "toga_iOS.app",
+    "Command": "toga_iOS.command",
+    "Camera": "toga_iOS.hardware.camera",
+    "native_color": "toga_iOS.colors",
+    "Font": "toga_iOS.fonts",
+    "Icon": "toga_iOS.icons",
+    "Image": "toga_iOS.images",
+    "Paths": "toga_iOS.paths",
+    "dialogs": "toga_iOS",
+    "Box": "toga_iOS.widgets.box",
+    "Button": "toga_iOS.widgets.button",
+    "Canvas": "toga_iOS.widgets.canvas",
+    "DetailedList": "toga_iOS.widgets.detailedlist",
+    "ImageView": "toga_iOS.widgets.imageview",
+    "Label": "toga_iOS.widgets.label",
+    "Location": "toga_iOS.hardware.location",
+    "MapView": "toga_iOS.widgets.mapview",
+    "MultilineTextInput": "toga_iOS.widgets.multilinetextinput",
+    "NumberInput": "toga_iOS.widgets.numberinput",
+    "OptionContainer": "toga_iOS.widgets.optioncontainer",
+    "PasswordInput": "toga_iOS.widgets.passwordinput",
+    "ProgressBar": "toga_iOS.widgets.progressbar",
+    "ScrollContainer": "toga_iOS.widgets.scrollcontainer",
+    "Selection": "toga_iOS.widgets.selection",
+    "Slider": "toga_iOS.widgets.slider",
+    "Switch": "toga_iOS.widgets.switch",
+    "TextInput": "toga_iOS.widgets.textinput",
+    "WebView": "toga_iOS.widgets.webview",
+    "Window": "toga_iOS.window",
+}
+
+
+__all__ = list(toga_ios_factory_imports.keys()) + ["not_implemented"]
+
+
+def __getattr__(name):
+    try:
+        module_name = toga_ios_factory_imports[name]
+
+        has_dot = module_name.find(".") != -1
+        if not has_dot:
+            module_name = f"toga_iOS.{name}"
+    except KeyError:
+        raise NotImplementedError(
+            f"Toga's iOS backend doesn't implement '{name}'"
+        ) from None
+    else:
+        module = importlib.import_module(module_name)
+        value = getattr(module, name) if has_dot else module
+        globals()[name] = value
+        return value
 
 
 def not_implemented(feature):
     NotImplementedWarning.warn("iOS", feature)
-
-
-__all__ = [
-    "not_implemented",
-    "App",
-    "MainWindow",
-    "Command",
-    # Resources
-    "native_color",  # colors
-    "Font",
-    "Icon",
-    "Image",
-    "Paths",
-    "dialogs",
-    # Hardware
-    "Camera",
-    "Location",
-    # Widgets
-    "Box",
-    "Button",
-    "Canvas",
-    "DetailedList",
-    "ImageView",
-    "Label",
-    "MapView",
-    "MultilineTextInput",
-    "NumberInput",
-    "OptionContainer",
-    "PasswordInput",
-    "ProgressBar",
-    "ScrollContainer",
-    "Selection",
-    "Slider",
-    # 'SplitContainer',
-    "Switch",
-    # 'Table',
-    "TextInput",
-    # 'Tree',
-    "WebView",
-    "Window",
-]
-
-
-def __getattr__(name):  # pragma: no cover
-    raise NotImplementedError(f"Toga's iOS backend doesn't implement {name}")
diff --git a/testbed/tests/test_factory.py b/testbed/tests/test_factory.py
new file mode 100644
index 0000000000..faeba66074
--- /dev/null
+++ b/testbed/tests/test_factory.py
@@ -0,0 +1,8 @@
+import pytest
+
+import toga
+
+
+def test_missing_widget():
+    with pytest.raises(NotImplementedError):
+        toga.platform.get_platform_factory().MissingWidget
diff --git a/textual/src/toga_textual/factory.py b/textual/src/toga_textual/factory.py
index 06217c2350..4d0318c26b 100644
--- a/textual/src/toga_textual/factory.py
+++ b/textual/src/toga_textual/factory.py
@@ -1,91 +1,67 @@
-from toga import NotImplementedWarning
+import importlib
 
-from . import dialogs
-from .app import App, DocumentApp, MainWindow
+from toga import NotImplementedWarning
 
-# from .command import Command
-# from .documents import Document
-# from .fonts import Font
-from .icons import Icon
+toga_textual_factory_imports = {
+    "App": "toga_textual.app",
+    "DocumentApp": "toga_textual.app",
+    "MainWindow": "toga_textual.app",
+    "dialogs": "toga_textual",
+    # "Command": "toga_textual.command",
+    # "Document": "toga_textual.documents",
+    # "Font": "toga_textual.fonts",
+    "Icon": "toga_textual.icons",
+    # "Image": "toga_textual.images",
+    "Paths": "toga_textual.paths",
+    # "ActivityIndicator": "toga_textual.widgets.activityindicator",
+    # "widget": "toga_textual.widgets.base",
+    "Box": "toga_textual.widgets.box",
+    "Button": "toga_textual.widgets.button",
+    # "Canvas": "toga_textual.widgets.canvas",
+    # "DateInput": "toga_textual.widgets.dateinput",
+    # "DetailedList": "toga_textual.widgets.detailedlist",
+    # "Divider": "toga_textual.widgets.divider",
+    # "ImageView": "toga_textual.widgets.imageview",
+    "Label": "toga_textual.widgets.label",
+    # "MultilineTextInput": "toga_textual.widgets.multilinetextinput",
+    # "NumberInput": "toga_textual.widgets.numberinput",
+    # "OptionContainer": "toga_textual.widgets.optioncontainer",
+    # "PasswordInput": "toga_textual.widgets.passwordinput",
+    # "ProgressBar": "toga_textual.widgets.progressbar",
+    # "ScrollContainer": "toga_textual.widgets.scrollcontainer",
+    # "Selection": "toga_textual.widgets.selection",
+    # "Slider": "toga_textual.widgets.slider",
+    # "SplitContainer": "toga_textual.widgets.splitcontainer",
+    # "Switch": "toga_textual.widgets.switch",
+    # "Table": "toga_textual.widgets.table",
+    "TextInput": "toga_textual.widgets.textinput",
+    # "TimeInput": "toga_textual.widgets.timeinput",
+    # "Tree": "toga_textual.widgets.tree",
+    # "WebView": "toga_textual.widgets.webview",
+    "Window": "toga_textual.window",
+}
 
-# from .images import Image
-from .paths import Paths
 
-# from .widgets.activityindicator import ActivityIndicator
-# from .widgets.base import Widget
-from .widgets.box import Box
-from .widgets.button import Button
+__all__ = list(toga_textual_factory_imports.keys()) + ["not_implemented"]
 
-# from .widgets.canvas import Canvas
-# from .widgets.dateinput import DateInput
-# from .widgets.detailedlist import DetailedList
-# from .widgets.divider import Divider
-# from .widgets.imageview import ImageView
-from .widgets.label import Label
 
-# from .widgets.multilinetextinput import MultilineTextInput
-# from .widgets.numberinput import NumberInput
-# from .widgets.optioncontainer import OptionContainer
-# from .widgets.passwordinput import PasswordInput
-# from .widgets.progressbar import ProgressBar
-# from .widgets.scrollcontainer import ScrollContainer
-# from .widgets.selection import Selection
-# from .widgets.slider import Slider
-# from .widgets.splitcontainer import SplitContainer
-# from .widgets.switch import Switch
-# from .widgets.table import Table
-from .widgets.textinput import TextInput
+def __getattr__(name):
+    try:
+        module_name = toga_textual_factory_imports[name]
 
-# from .widgets.timeinput import TimeInput
-# from .widgets.tree import Tree
-# from .widgets.webview import WebView
-from .window import Window
+        has_dot = module_name.find(".") != -1
+        if not has_dot:
+            module_name = f"toga_textual.{name}"
+    except KeyError:
+        raise NotImplementedError(
+            f"Toga's Textual backend doesn't implement '{name}'"
+        ) from None
+    else:
+        module = importlib.import_module(module_name)
+        value = getattr(module, name) if has_dot else module
+        globals()[name] = value
+        return value
 
 
 def not_implemented(feature):
     NotImplementedWarning.warn("Textual", feature)  # pragma: nocover
-
-
-__all__ = [
-    "not_implemented",
-    "App",
-    "DocumentApp",
-    "MainWindow",
-    # "Command",
-    # "Document",
-    # "Font",
-    "Icon",
-    # "Image",
-    "Paths",
-    "dialogs",
-    # # Widgets
-    # "ActivityIndicator",
-    "Box",
-    "Button",
-    # "Canvas",
-    # "DateInput",
-    # "DetailedList",
-    # "Divider",
-    # "ImageView",
-    "Label",
-    # "MultilineTextInput",
-    # "NumberInput",
-    # "OptionContainer",
-    # "PasswordInput",
-    # "ProgressBar",
-    # "ScrollContainer",
-    # "Selection",
-    # "Slider",
-    # "SplitContainer",
-    # "Switch",
-    # "Table",
-    "TextInput",
-    # "TimeInput",
-    # "Tree",
-    # "WebView",
-    "Window",
-]
-
-
-def __getattr__(name):  # pragma: no cover
-    raise NotImplementedError(f"Toga's Textual backend doesn't implement {name}")
diff --git a/web/src/toga_web/factory.py b/web/src/toga_web/factory.py
index bef184f1d9..9f9d8c2bd3 100644
--- a/web/src/toga_web/factory.py
+++ b/web/src/toga_web/factory.py
@@ -1,88 +1,63 @@
-from toga import NotImplementedWarning
-
-from . import dialogs
-from .app import App, MainWindow  # DocumentApp
-from .command import Command
-
-# from .documents import Document
-# from .fonts import Font
-from .icons import Icon
-
-# from .images import Image
-from .paths import Paths
-from .widgets.activityindicator import ActivityIndicator
-from .widgets.box import Box
-from .widgets.button import Button
-from .widgets.divider import Divider
-
-# from .widgets.canvas import Canvas
-# from .widgets.detailedlist import DetailedList
-# from .widgets.imageview import ImageView
-from .widgets.label import Label
-
-# from .widgets.multilinetextinput import MultilineTextInput
-# from .widgets.numberinput import NumberInput
-# from .widgets.optioncontainer import OptionContainer
-from .widgets.passwordinput import PasswordInput
-from .widgets.progressbar import ProgressBar
+import importlib
 
-# from .widgets.scrollcontainer import ScrollContainer
-# from .widgets.selection import Selection
-# from .widgets.slider import Slider
-# from .widgets.splitcontainer import SplitContainer
-from .widgets.switch import Switch
-
-# from .widgets.table import Table
-from .widgets.textinput import TextInput
+from toga import NotImplementedWarning
 
-# from .widgets.tree import Tree
-# from .widgets.webview import WebView
-# from .window import Window
+toga_web_factory_imports = {
+    "App": "toga_web.app",
+    "MainWindow": "toga_web.app",
+    "Command": "toga_web.command",
+    "dialogs": "toga_web",
+    # "DocumentApp": "toga_web.app",
+    # "Document": "toga_web.documents",
+    # "Font": "toga_web.fonts",
+    "Icon": "toga_web.icons",
+    "Paths": "toga_web.paths",
+    # "Image": "toga_web.images",
+    "ActivityIndicator": "toga_web.widgets.activityindicator",
+    "Box": "toga_web.widgets.box",
+    "Button": "toga_web.widgets.button",
+    "Divider": "toga_web.widgets.divider",
+    # "Canvas": "toga_web.widgets.canvas",
+    # "DetailedList": "toga_web.widgets.detailedlist",
+    # "ImageView": "toga_web.widgets.imageview",
+    "Label": "toga_web.widgets.label",
+    # "MultilineTextInput": "toga_web.widgets.multilinetextinput",
+    # "NumberInput": "toga_web.widgets.numberinput",
+    # "OptionContainer": "toga_web.widgets.optioncontainer",
+    "PasswordInput": "toga_web.widgets.passwordinput",
+    "ProgressBar": "toga_web.widgets.progressbar",
+    # "ScrollContainer": "toga_web.widgets.scrollcontainer",
+    # "Selection": "toga_web.widgets.selection",
+    # "Slider": "toga_web.widgets.slider",
+    # "SplitContainer": "toga_web.widgets.splitcontainer",
+    "Switch": "toga_web.widgets.switch",
+    # "Table": "toga_web.widgets.table",
+    "TextInput": "toga_web.widgets.textinput",
+    # "Tree": "toga_web.widgets.tree",
+    # "WebView": "toga_web.widgets.webview",
+    # "Window": "toga_web.window",
+}
+
+__all__ = list(toga_web_factory_imports.keys()) + ["not_implemented"]
+
+
+def __getattr__(name):
+    try:
+        module_name = toga_web_factory_imports[name]
+
+        has_dot = module_name.find(".") != -1
+        if not has_dot:
+            module_name = f"toga_iOS.{name}"
+    except KeyError:
+        raise NotImplementedError(
+            f"Toga's Web backend doesn't implement '{name}'"
+        ) from None
+    else:
+        module = importlib.import_module(module_name)
+        value = getattr(module, name) if has_dot else module
+        globals()[name] = value
+        return value
 
 
 def not_implemented(feature):
-    NotImplementedWarning.warn("Web", feature)  # pragma: nocover
-
-
-__all__ = [
-    "not_implemented",
-    "App",
-    "MainWindow",
-    # 'DocumentApp',
-    "Command",
-    # 'Document',
-    # # Resources
-    # 'Font',
-    "Icon",
-    # 'Image',
-    "Paths",
-    "dialogs",
-    # # Widgets
-    "Box",
-    "Button",
-    # 'Canvas',
-    "Divider",
-    # 'DetailedList',
-    # 'ImageView',
-    "Label",
-    # 'MultilineTextInput',
-    # 'NumberInput',
-    # 'OptionContainer',
-    "PasswordInput",
-    "ProgressBar",
-    "ActivityIndicator",
-    # 'ScrollContainer',
-    # 'Selection',
-    # 'Slider',
-    # 'SplitContainer',
-    "Switch",
-    # 'Table',
-    "TextInput",
-    # 'Tree',
-    # 'WebView',
-    # 'Window',
-]
-
-
-def __getattr__(name):  # pragma: no cover
-    raise NotImplementedError(f"Toga's Web backend doesn't implement {name}")
+    NotImplementedWarning.warn("Web", feature)
diff --git a/winforms/src/toga_winforms/factory.py b/winforms/src/toga_winforms/factory.py
index 80f097ea10..150bee78a9 100644
--- a/winforms/src/toga_winforms/factory.py
+++ b/winforms/src/toga_winforms/factory.py
@@ -1,80 +1,63 @@
-from toga import NotImplementedWarning
+import importlib
 
-from . import dialogs
-from .app import App, MainWindow
-from .command import Command
-from .fonts import Font
-from .icons import Icon
-from .images import Image
-from .paths import Paths
-from .widgets.box import Box
-from .widgets.button import Button
-from .widgets.canvas import Canvas
-from .widgets.dateinput import DateInput
-from .widgets.detailedlist import DetailedList
-from .widgets.divider import Divider
-from .widgets.imageview import ImageView
-from .widgets.label import Label
-from .widgets.mapview import MapView
-from .widgets.multilinetextinput import MultilineTextInput
-from .widgets.numberinput import NumberInput
-from .widgets.optioncontainer import OptionContainer
-from .widgets.passwordinput import PasswordInput
-from .widgets.progressbar import ProgressBar
-from .widgets.scrollcontainer import ScrollContainer
-from .widgets.selection import Selection
-from .widgets.slider import Slider
-from .widgets.splitcontainer import SplitContainer
-from .widgets.switch import Switch
-from .widgets.table import Table
-from .widgets.textinput import TextInput
-from .widgets.timeinput import TimeInput
-from .widgets.webview import WebView
-from .window import Window
+from toga import NotImplementedWarning
 
 
 def not_implemented(feature):
-    NotImplementedWarning.warn("Winforms", feature)  # pragma: nocover
+    NotImplementedWarning.warn("winforms", feature)
+
+
+winforms_factory_imports = {
+    "App": "toga_winforms.app",
+    "MainWindow": "toga_winforms.app",
+    "Command": "toga_winforms.command",
+    "dialogs": "toga_winforms",
+    "Font": "toga_winforms.fonts",
+    "Icon": "toga_winforms.icons",
+    "Image": "toga_winforms.images",
+    "Paths": "toga_winforms.paths",
+    "Box": "toga_winforms.widgets.box",
+    "Button": "toga_winforms.widgets.button",
+    "Canvas": "toga_winforms.widgets.canvas",
+    "DetailedList": "toga_winforms.widgets.detailedlist",
+    "Divider": "toga_winforms.widgets.divider",
+    "DateInput": "toga_winforms.widgets.dateinput",
+    "ImageView": "toga_winforms.widgets.imageview",
+    "Label": "toga_winforms.widgets.label",
+    "MapView": "toga_winforms.widgets.mapview",
+    "MultilineTextInput": "toga_winforms.widgets.multilinetextinput",
+    "NumberInput": "toga_winforms.widgets.numberinput",
+    "OptionContainer": "toga_winforms.widgets.optioncontainer",
+    "PasswordInput": "toga_winforms.widgets.passwordinput",
+    "ProgressBar": "toga_winforms.widgets.progressbar",
+    "ScrollContainer": "toga_winforms.widgets.scrollcontainer",
+    "Selection": "toga_winforms.widgets.selection",
+    "Slider": "toga_winforms.widgets.slider",
+    "SplitContainer": "toga_winforms.widgets.splitcontainer",
+    "Switch": "toga_winforms.widgets.switch",
+    "Table": "toga_winforms.widgets.table",
+    "TextInput": "toga_winforms.widgets.textinput",
+    "TimeInput": "toga_winforms.widgets.timeinput",
+    "WebView": "toga_winforms.widgets.webview",
+    "Window": "toga_winforms.window",
+}
 
+__all__ = list(winforms_factory_imports.keys()) + ["not_implemented"]
 
-__all__ = [
-    "not_implemented",
-    "App",
-    "MainWindow",
-    "Command",
-    # Resources
-    "Font",
-    "Icon",
-    "Image",
-    "Paths",
-    "dialogs",
-    # Widgets
-    "Box",
-    "Button",
-    "Canvas",
-    "DateInput",
-    "DetailedList",
-    "Divider",
-    "ImageView",
-    "Label",
-    "MapView",
-    "MultilineTextInput",
-    "NumberInput",
-    "OptionContainer",
-    "PasswordInput",
-    "ProgressBar",
-    "ScrollContainer",
-    "Selection",
-    "Slider",
-    "SplitContainer",
-    "Switch",
-    "Table",
-    "TextInput",
-    "TimeInput",
-    "WebView",
-    "Window",
-]
 
+def __getattr__(name):
+    try:
+        module_name = winforms_factory_imports[name]
 
-def __getattr__(name):  # pragma: no cover
-    raise NotImplementedError(f"Toga's Winforms backend doesn't implement {name}")
+        has_dot = module_name.find(".") != -1
+        if not has_dot:
+            module_name = f"toga_winforms.{name}"
+    except KeyError:
+        raise NotImplementedError(
+            f"Toga's Winforms backend doesn't implement '{name}'"
+        ) from None
+    else:
+        module = importlib.import_module(module_name)
+        value = getattr(module, name) if has_dot else module
+        globals()[name] = value
+        return value