diff --git a/Tests/test_imagefile.py b/Tests/test_imagefile.py
index a9444c26d..d4dfb1b6d 100644
--- a/Tests/test_imagefile.py
+++ b/Tests/test_imagefile.py
@@ -151,11 +151,6 @@ class TestImageFile:
         # Despite multiple tiles, assert only one tile caused a read of maxblock size
         assert reads.count(im.decodermaxblock) == 1
 
-    def test_raise_oserror(self) -> None:
-        with pytest.warns(DeprecationWarning, match="raise_oserror"):
-            with pytest.raises(OSError):
-                ImageFile.raise_oserror(1)
-
     def test_raise_typeerror(self) -> None:
         with pytest.raises(TypeError):
             parser = ImageFile.Parser()
diff --git a/docs/deprecations.rst b/docs/deprecations.rst
index 5ecd7de42..4a208f212 100644
--- a/docs/deprecations.rst
+++ b/docs/deprecations.rst
@@ -12,16 +12,6 @@ Deprecated features
 Below are features which are considered deprecated. Where appropriate,
 a :py:exc:`DeprecationWarning` is issued.
 
-ImageFile.raise_oserror
-~~~~~~~~~~~~~~~~~~~~~~~
-
-.. deprecated:: 10.2.0
-
-``ImageFile.raise_oserror()`` has been deprecated and will be removed in Pillow
-12.0.0 (2025-10-15). The function is undocumented and is only useful for translating
-error codes returned by a codec's ``decode()`` method, which ImageFile already does
-automatically.
-
 IptcImageFile helper functions
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -206,6 +196,16 @@ Removed features
 Deprecated features are only removed in major releases after an appropriate
 period of deprecation has passed.
 
+ImageFile.raise_oserror
+~~~~~~~~~~~~~~~~~~~~~~~
+
+.. deprecated:: 10.2.0
+.. versionremoved:: 12.0.0
+
+``ImageFile.raise_oserror()`` has been removed. The function was undocumented and was
+only useful for translating error codes returned by a codec's ``decode()`` method,
+which ImageFile already did automatically.
+
 BGR;15, BGR 16 and BGR;24
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/src/PIL/ImageFile.py b/src/PIL/ImageFile.py
index bf556a2c6..27b27127e 100644
--- a/src/PIL/ImageFile.py
+++ b/src/PIL/ImageFile.py
@@ -37,7 +37,6 @@ import struct
 from typing import IO, Any, NamedTuple, cast
 
 from . import ExifTags, Image
-from ._deprecate import deprecate
 from ._util import DeferredError, is_path
 
 TYPE_CHECKING = False
@@ -83,16 +82,6 @@ def _get_oserror(error: int, *, encoder: bool) -> OSError:
     return OSError(msg)
 
 
-def raise_oserror(error: int) -> OSError:
-    deprecate(
-        "raise_oserror",
-        12,
-        action="It is only useful for translating error codes returned by a codec's "
-        "decode() method, which ImageFile already does automatically.",
-    )
-    raise _get_oserror(error, encoder=False)
-
-
 def _tilesort(t: _Tile) -> int:
     # sort on offset
     return t[2]