diff --git a/src/kikuchipy/io/_io.py b/src/kikuchipy/io/_io.py
index 55e083d5..ccd1db78 100644
--- a/src/kikuchipy/io/_io.py
+++ b/src/kikuchipy/io/_io.py
@@ -174,7 +174,7 @@ def _dict2signal(
             record_by = md["Signal"]["record_by"]
             if record_by != "image":
                 raise ValueError(
-                    "kikuchipy only supports `record_by = image`, not " f"{record_by}"
+                    f"kikuchipy only supports `record_by = image`, not {record_by}"
                 )
             del md["Signal"]["record_by"]
         if "Signal" in md and "signal_type" in md["Signal"]:
diff --git a/src/kikuchipy/io/plugins/oxford_master_pattern/__init__.py b/src/kikuchipy/io/plugins/oxford_master_pattern/__init__.py
new file mode 100644
index 00000000..2f857066
--- /dev/null
+++ b/src/kikuchipy/io/plugins/oxford_master_pattern/__init__.py
@@ -0,0 +1,23 @@
+# Copyright 2019-2024 The kikuchipy developers
+#
+# This file is part of kikuchipy.
+#
+# kikuchipy is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# kikuchipy is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with kikuchipy. If not, see <http://www.gnu.org/licenses/>.
+
+import lazy_loader
+
+__getattr__, __dir__, __all__ = lazy_loader.attach_stub(__name__, __file__)
+
+
+del lazy_loader
diff --git a/src/kikuchipy/io/plugins/oxford_master_pattern/__init__.pyi b/src/kikuchipy/io/plugins/oxford_master_pattern/__init__.pyi
new file mode 100644
index 00000000..65a3a663
--- /dev/null
+++ b/src/kikuchipy/io/plugins/oxford_master_pattern/__init__.pyi
@@ -0,0 +1,20 @@
+# Copyright 2019-2024 The kikuchipy developers
+#
+# This file is part of kikuchipy.
+#
+# kikuchipy is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# kikuchipy is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with kikuchipy. If not, see <http://www.gnu.org/licenses/>.
+
+from ._api import file_reader
+
+__all__ = ["file_reader"]
diff --git a/src/kikuchipy/io/plugins/oxford_master_pattern/_api.py b/src/kikuchipy/io/plugins/oxford_master_pattern/_api.py
new file mode 100644
index 00000000..97b4455b
--- /dev/null
+++ b/src/kikuchipy/io/plugins/oxford_master_pattern/_api.py
@@ -0,0 +1,243 @@
+# Copyright 2019-2024 The kikuchipy developers
+#
+# This file is part of kikuchipy.
+#
+# kikuchipy is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# kikuchipy is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with kikuchipy. If not, see <http://www.gnu.org/licenses/>.
+
+"""Reader of EBSD master pattern simulations from an Oxford Instruments
+SDF5 (HDF5) file.
+"""
+
+from pathlib import Path
+from typing import Literal
+
+import dask.array as da
+from diffpy.structure import Lattice, Structure
+import h5py
+import numpy as np
+from orix.crystal_map import Phase
+
+from kikuchipy._utils.vector import ValidHemispheres, parse_hemisphere
+from kikuchipy.io.plugins._h5ebsd import _hdf5group2dict
+from kikuchipy.io.plugins.emsoft_ebsd_master_pattern._api import HEMISPHERE_ARG
+
+ValidSimulationTypes = Literal["dynamical", "twobeam", "kinematic"]
+
+
+class OxfordMasterPatternReader:
+    def __init__(
+        self,
+        filename: str | Path,
+        energy: range | None = None,
+        hemisphere: ValidHemispheres = "both",
+        simulation: ValidSimulationTypes = "dynamical",
+        lazy: bool = False,
+    ) -> None:
+        self.filename = Path(filename)
+        self.energy = energy
+        self.hemisphere = parse_hemisphere(hemisphere)
+        self.simulation = self.parse_simulation(simulation)
+        self.lazy = lazy
+
+    @staticmethod
+    def check_file_format(file: h5py.File) -> None:
+        if not "Proprietary/Source Info" in file:
+            raise IOError(f"{file.filename!r} is not an Oxford Instruments SDF5 file")
+
+    def get_axes(self, data_shape: tuple[int, ...]) -> list[dict]:
+        sy, sx = data_shape[-2:]
+        names = ["height", "width"]
+        units = ["px", "px"]
+        offsets = [-sy // 2, -sx // 2]
+        if self.hemisphere == "both":
+            names.insert(0, "hemisphere")
+            offsets.insert(0, 0)
+            units.insert(0, "")
+        axes = []
+        for i in range(len(data_shape)):
+            axis = {
+                "size": data_shape[i],
+                "index_in_array": i,
+                "name": names[i],
+                "scale": 1,
+                "offset": offsets[i],
+                "units": units[i],
+            }
+            axes.append(axis)
+        return axes
+
+    def parse_data(self, group: h5py.Group) -> dict:
+        d = _hdf5group2dict(group["Reflectors"])
+        data_group = group[f"Master/{self.simulation}"]
+        data_kwargs = {}
+        if self.lazy:
+            data_read_func = da.from_array
+            data_stack_func = da.stack
+            data_kwargs["chunks"] = "auto"
+        else:
+            data_read_func = np.asanyarray
+            data_stack_func = np.stack
+        if self.hemisphere == "upper":
+            data = data_read_func(data_group["Upper"], **data_kwargs)
+        elif self.hemisphere == "lower":
+            data = data_read_func(data_group["Lower"], **data_kwargs)
+        else:
+            upper = data_read_func(data_group["Upper"], **data_kwargs)
+            lower = data_read_func(data_group["Lower"], **data_kwargs)
+            data = data_stack_func([upper, lower], axis=0)
+        return {
+            "data": data,
+            "reflectors": {
+                "extinction_distances": d["Extinction Distances"],
+                "hkl": d["HKL"],
+                "lattice_spacing": d["Lattice Spacing"],
+                "normal_directions": d["Normal Directions"],
+                "relative_intensities": d["Relative Intensities"],
+            },
+        }
+
+    def parse_header(self, group: h5py.Group) -> dict:
+        d = _hdf5group2dict(group)
+        phase_info = self.parse_phase_info(group["Phase Info"])
+        return {
+            "beam_energy": d["Beam Voltage"],
+            "debye_waller_factor": d["Debye-Waller Factor"],
+            "minimum_intensity": d["Minimum Intensity"],
+            "minimum_lattice_spacing": d["Minimum Lattice Spacing"],
+            "phase": phase_info,
+        }
+
+    @staticmethod
+    def parse_phase_info(group: h5py.Group) -> dict:
+        d = _hdf5group2dict(group)
+        abc = d["Lattice Dimensions"]
+        # TODO: (a, b, c) unit options are Angstrom and ...? Figure out
+        # the others, so we always return Ångstrøm.
+        # dimension_unit = group["Lattice Dimensions"].attrs["Unit"]
+        angles = d["Lattice Angles"]
+        angle_unit = group["Lattice Angles"].attrs["Unit"]
+        if angle_unit == "rad":
+            angles = np.rad2deg(angles)
+        return {
+            "laue_group": d["Laue Group"],
+            "name": d["Phase Name"],
+            "reference": d["Reference"],
+            "space_group": d["Space Group"],
+            "structure": {
+                "title": d["Phase Name"],
+                "lattice": {
+                    "a": abc[0],
+                    "b": abc[1],
+                    "c": abc[2],
+                    "alpha": angles[0],
+                    "beta": angles[1],
+                    "gamma": angles[2],
+                },
+            },
+        }
+
+    @staticmethod
+    def parse_simulation(simulation: ValidSimulationTypes) -> str:
+        sim = simulation.lower()
+        options = ["dynamical", "twobeam", "kinematic"]
+        if sim not in options:
+            raise ValueError(
+                f"Unknown simulation type {simulation!r}. Options are "
+                + ",".join(options)
+                + "."
+            )
+        sim = sim.capitalize()
+        if sim == "Twobeam":
+            sim = "TwoBeam"
+        return sim
+
+    def read(self, **kwargs) -> list[dict]:
+        file = h5py.File(self.filename, mode="r", **kwargs)
+        self.check_file_format(file)
+        header = self.parse_header(file["Header"])
+        all_data = self.parse_data(file["Data"])
+        md = {
+            "Acquisition_instrument": {
+                "SEM": {"beam_energy": header.pop("beam_energy")}
+            },
+            "General": {
+                "original_filename": self.filename.name,
+                "title": self.filename.stem,
+            },
+            "Signal": {"record_by": "image", "signal_type": "EBSDMasterPattern"},
+        }
+        phase_info = header.pop("phase")
+        phase = Phase(
+            name=phase_info["name"],
+            space_group=int(phase_info["space_group"]),
+            structure=Structure(
+                title=phase_info["structure"]["title"],
+                lattice=Lattice(**phase_info["structure"]["lattice"]),
+            ),
+        )
+        data = all_data.pop("data")
+        out = {
+            "axes": self.get_axes(data.shape),
+            "data": data,
+            "hemisphere": "both",
+            "metadata": md,
+            "phase": phase,
+            "projection": "stereographic",
+        }
+        omd = header
+        omd.update(all_data)
+        out["original_metadata"] = omd
+        if not self.lazy:
+            file.close()
+        return [out]
+
+
+def file_reader(
+    filename: str | Path,
+    energy: range | None = None,
+    hemisphere: ValidHemispheres = "both",
+    simulation: ValidSimulationTypes = "dynamical",
+    lazy: bool = False,
+    **kwargs,
+) -> list[dict]:
+    """Read simulated electron backscatter diffraction master patterns
+    from Oxford Instruments' SDF5 (HDF5) file format.
+
+    Not meant to be used directly; use :func:`~kikuchipy.load`.
+
+    Parameters
+    ----------
+    filename
+        Full file path of the SDF5 file.
+    energy
+        Desired beam energy. If not given, the simulation for the
+        highest beam energy is returned.
+    hemisphere
+        Projection hemisphere(s) to read. Options are "both" (default),
+        "upper", or "lower". If "both", these will be stacked in the
+        vertical navigation axis.
+    lazy
+        Open the data lazily without actually reading the data from disk
+        until requested. Allows opening datasets larger than available
+        memory. Default is False.
+    **kwargs
+        Keyword arguments passed to :class:`h5py.File`.
+
+    Returns
+    -------
+    signal_dict_list
+        Data, axes, metadata, and original metadata.
+    """
+    reader = OxfordMasterPatternReader(filename, energy, hemisphere, simulation, lazy)
+    return reader.read(**kwargs)
diff --git a/src/kikuchipy/io/plugins/oxford_master_pattern/specification.yaml b/src/kikuchipy/io/plugins/oxford_master_pattern/specification.yaml
new file mode 100644
index 00000000..9c915c46
--- /dev/null
+++ b/src/kikuchipy/io/plugins/oxford_master_pattern/specification.yaml
@@ -0,0 +1,9 @@
+name: oxford_master_pattern
+description: >
+  Read support for simulated electron backscatter diffraction (EBSD)
+  master patterns stored in an Oxford Instruments *.sdf5 (HDF5) file.
+file_extensions: ['sdf5']
+default_extension: 0
+writes: False
+manufacturer: oxford
+footprints: ['Proprietary/Source Info']