diff --git a/doc/api/next_api_changes/removals/26910-JP.rst b/doc/api/next_api_changes/removals/26910-JP.rst
new file mode 100644
index 000000000000..0de12cd89ad5
--- /dev/null
+++ b/doc/api/next_api_changes/removals/26910-JP.rst
@@ -0,0 +1,13 @@
+``offsetbox.bbox_artist``
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+... is removed. This was just a wrapper to call `.patches.bbox_artist` if a flag is set in the file, so use that directly if you need the behavior.
+
+``offsetBox.get_extent_offsets`` and ``offsetBox.get_extent``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+... are removed; these methods are also removed on all subclasses of `.OffsetBox`.
+
+... To get the offsetbox extents, instead of ``get_extent``, use `.OffsetBox.get_bbox`, which directly returns a `.Bbox` instance.
+
+... To also get the child offsets, instead of ``get_extent_offsets``, separately call `~.OffsetBox.get_offset` on each children after triggering a draw.
diff --git a/lib/matplotlib/offsetbox.py b/lib/matplotlib/offsetbox.py
index bb117c38cece..acf93f5a34d9 100644
--- a/lib/matplotlib/offsetbox.py
+++ b/lib/matplotlib/offsetbox.py
@@ -61,12 +61,6 @@ def get_offset(self, *args, **kwargs):
     return get_offset
 
 
-@_api.deprecated("3.7", alternative='patches.bbox_artist')
-def bbox_artist(*args, **kwargs):
-    if DEBUG:
-        mbbox_artist(*args, **kwargs)
-
-
 # for debugging use
 def _bbox_artist(*args, **kwargs):
     if DEBUG:
@@ -366,32 +360,6 @@ def get_bbox(self, renderer):
         bbox, offsets = self._get_bbox_and_child_offsets(renderer)
         return bbox
 
-    @_api.deprecated("3.7", alternative="get_bbox and child.get_offset")
-    def get_extent_offsets(self, renderer):
-        """
-        Update offset of the children and return the extent of the box.
-
-        Parameters
-        ----------
-        renderer : `.RendererBase` subclass
-
-        Returns
-        -------
-        width
-        height
-        xdescent
-        ydescent
-        list of (xoffset, yoffset) pairs
-        """
-        bbox, offsets = self._get_bbox_and_child_offsets(renderer)
-        return bbox.width, bbox.height, -bbox.x0, -bbox.y0, offsets
-
-    @_api.deprecated("3.7", alternative="get_bbox")
-    def get_extent(self, renderer):
-        """Return a tuple ``width, height, xdescent, ydescent`` of the box."""
-        bbox = self.get_bbox(renderer)
-        return bbox.width, bbox.height, -bbox.x0, -bbox.y0
-
     def get_window_extent(self, renderer=None):
         # docstring inherited
         if renderer is None:
diff --git a/lib/matplotlib/offsetbox.pyi b/lib/matplotlib/offsetbox.pyi
index 7d7f4d8f67ec..09f89aed2bc8 100644
--- a/lib/matplotlib/offsetbox.pyi
+++ b/lib/matplotlib/offsetbox.pyi
@@ -15,7 +15,6 @@ from typing import Any, Literal, overload
 
 DEBUG: bool
 
-def bbox_artist(*args, **kwargs) -> None: ...
 def _get_packed_offsets(
     widths: Sequence[float],
     total: float | None,
@@ -51,12 +50,6 @@ class OffsetBox(martist.Artist):
     def get_visible_children(self) -> list[martist.Artist]: ...
     def get_children(self) -> list[martist.Artist]: ...
     def get_bbox(self, renderer: RendererBase) -> Bbox: ...
-    def get_extent_offsets(
-        self, renderer: RendererBase
-    ) -> tuple[float, float, float, float, list[tuple[float, float]]]: ...
-    def get_extent(
-        self, renderer: RendererBase
-    ) -> tuple[float, float, float, float]: ...
     def get_window_extent(self, renderer: RendererBase | None = ...) -> Bbox: ...
 
 class PackerBase(OffsetBox):