diff --git a/doc/source/changelog.rst b/doc/source/changelog.rst
index a57c5b06..7d229a5c 100644
--- a/doc/source/changelog.rst
+++ b/doc/source/changelog.rst
@@ -8,6 +8,7 @@ MontePy Changelog
 ----------------------
 
 **Bug fixes**
+* Fixed bug with parsing tally segments (#377)
 
 **Documentation**
 
diff --git a/montepy/data_inputs/data_parser.py b/montepy/data_inputs/data_parser.py
index ab893003..5e8b9b1b 100644
--- a/montepy/data_inputs/data_parser.py
+++ b/montepy/data_inputs/data_parser.py
@@ -7,6 +7,7 @@
     material,
     mode,
     tally,
+    tally_segment,
     tally_multiplier,
     thermal_scattering,
     universe_input,
@@ -23,6 +24,7 @@
     mode.Mode,
     tally.Tally,
     tally_multiplier.TallyMultiplier,
+    tally_segment.TallySegment,
     thermal_scattering.ThermalScatteringLaw,
     transform.Transform,
     volume.Volume,
diff --git a/montepy/data_inputs/tally_segment.py b/montepy/data_inputs/tally_segment.py
new file mode 100644
index 00000000..9a78cea2
--- /dev/null
+++ b/montepy/data_inputs/tally_segment.py
@@ -0,0 +1,22 @@
+# Copyright 2024, Battelle Energy Alliance, LLC All Rights Reserved.
+import montepy
+from montepy.data_inputs.data_input import DataInputAbstract
+from montepy.input_parser.tally_seg_parser import TallySegmentParser
+
+
+class TallySegment(DataInputAbstract):
+    """ """
+
+    _parser = TallySegmentParser()
+
+    @staticmethod
+    def _class_prefix():
+        return "fs"
+
+    @staticmethod
+    def _has_number():
+        return True
+
+    @staticmethod
+    def _has_classifier():
+        return 0
diff --git a/montepy/input_parser/tally_seg_parser.py b/montepy/input_parser/tally_seg_parser.py
new file mode 100644
index 00000000..25ae0856
--- /dev/null
+++ b/montepy/input_parser/tally_seg_parser.py
@@ -0,0 +1,61 @@
+# Copyright 2024, Battelle Energy Alliance, LLC All Rights Reserved.
+from montepy.input_parser.data_parser import DataParser
+from montepy.input_parser import syntax_node
+
+
+class TallySegmentParser(DataParser):
+    """ """
+
+    debugfile = None
+
+    @_("introduction tally_specification")
+    def tally(self, p):
+        ret = {}
+        for key, node in p.introduction.nodes.items():
+            ret[key] = node
+        ret["tally"] = p.tally_specification
+        return syntax_node.SyntaxNode("data", ret)
+
+    @_(
+        "tally_numbers",
+        "tally_numbers end_phrase",
+        "tally_numbers end_phrase end_phrase",
+    )
+    def tally_specification(self, p):
+        if hasattr(p, "end_phrase"):
+            text = p.end_phrase
+        else:
+            text = syntax_node.ValueNode(None, str)
+
+        return syntax_node.SyntaxNode(
+            "tally list", {"tally": p.tally_numbers, "end": text}
+        )
+
+    @_("PARTICLE", "PARTICLE padding", "TEXT", "TEXT padding")
+    def end_phrase(self, p):
+        """
+        A non-zero number with or without padding.
+
+        :returns: a float ValueNode
+        :rtype: ValueNode
+        """
+        return self._flush_phrase(p, str)
+
+    @_(
+        "tally_numbers tally_numbers",
+        "number_sequence",
+        "tally_numbers padding",
+    )
+    def tally_numbers(self, p):
+        if hasattr(p, "tally_numbers"):
+            ret = p.tally_numbers
+            ret.nodes["right"] += p.padding
+            return ret
+        if hasattr(p, "tally_numbers1"):
+            return syntax_node.SyntaxNode("tally tree", {"left": p[0], "right": p[1]})
+        else:
+            left = syntax_node.PaddingNode(None)
+            right = syntax_node.PaddingNode(None)
+            return syntax_node.SyntaxNode(
+                "tally set", {"left": left, "tally": p[0], "right": right}
+            )
diff --git a/tests/test_tally.py b/tests/test_tally.py
index 9e38df73..9b840321 100644
--- a/tests/test_tally.py
+++ b/tests/test_tally.py
@@ -6,6 +6,7 @@
 
 
 from unittest import TestCase
+import pytest
 
 
 class TestTallyParser(TestCase):
@@ -38,3 +39,18 @@ def test_parsing_tally_multiplier(self):
             print(test)
             input = Input([test], BlockType.DATA)
             data = parse_data(input)
+
+
+@pytest.mark.parametrize(
+    "line",
+    [
+        "fs14 -123",
+        "fs12 -456 t",
+        "fs11 -1 -2",
+        "fs16 +1 +2 c",
+        "fs17 -1 -2 t c",
+    ],
+)
+def test_tally_segment_init(line):
+    input = Input([line], BlockType.DATA)
+    data = parse_data(input)