diff --git a/stdlib/_typeshed/__init__.pyi b/stdlib/_typeshed/__init__.pyi
index 1b54284fe..f01db74ca 100644
--- a/stdlib/_typeshed/__init__.pyi
+++ b/stdlib/_typeshed/__init__.pyi
@@ -236,6 +236,29 @@ else:
 ReadableBuffer: TypeAlias = ReadOnlyBuffer | WriteableBuffer  # stable
 _BufferWithLen: TypeAlias = ReadableBuffer  # not stable  # noqa: Y047
 
+# Anything that implements the read-write buffer interface, and can be sliced/indexed.
+SliceableBuffer: TypeAlias = bytes | bytearray | memoryview | array.array[Any] | mmap.mmap
+IndexableBuffer: TypeAlias = bytes | bytearray | memoryview | array.array[Any] | mmap.mmap
+# https://github.com/python/typeshed/pull/9115#issuecomment-1304905864
+# Post PEP 688, they should be rewritten as such:
+# from collections.abc import Sequence
+# from typing import Sized, overload
+# class SliceableBuffer(Protocol):
+#     def __buffer__(self, __flags: int) -> memoryview: ...
+#     def __getitem__(self, __slice: slice) -> Sequence[int]: ...
+# class IndexableBuffer(Protocol):
+#     def __buffer__(self, __flags: int) -> memoryview: ...
+#     def __getitem__(self, __i: int) -> int: ...
+# class SupportsGetItemBuffer(SliceableBuffer, IndexableBuffer, Protocol):
+#     def __buffer__(self, __flags: int) -> memoryview: ...
+#     def __contains__(self, __x: Any) -> bool: ...
+#     @overload
+#     def __getitem__(self, __slice: slice) -> Sequence[int]: ...
+#     @overload
+#     def __getitem__(self, __i: int) -> int: ...
+# class SizedBuffer(Sized, Protocol):  # instead of _BufferWithLen
+#     def __buffer__(self, __flags: int) -> memoryview: ...
+
 ExcInfo: TypeAlias = tuple[type[BaseException], BaseException, TracebackType]
 OptExcInfo: TypeAlias = Union[ExcInfo, tuple[None, None, None]]