python
diff --git a/Doc/data/stable_abi.dat b/Doc/data/stable_abi.dat
@@ -189,6 +189,7 @@ var,PyExc_ArithmeticError,3.2,
 var,PyExc_AssertionError,3.2,
 var,PyExc_AttributeError,3.2,
 var,PyExc_BaseException,3.2,
+var,PyExc_BaseExceptionGroup,3.11,
 var,PyExc_BlockingIOError,3.7,
 var,PyExc_BrokenPipeError,3.7,
 var,PyExc_BufferError,3.2,
@@ -203,6 +204,7 @@ var,PyExc_EOFError,3.2,
 var,PyExc_EncodingWarning,3.10,
 var,PyExc_EnvironmentError,3.2,
 var,PyExc_Exception,3.2,
+var,PyExc_ExceptionGroup,3.11,
 var,PyExc_FileExistsError,3.7,
 var,PyExc_FileNotFoundError,3.7,
 var,PyExc_FloatingPointError,3.2,

diff --git a/Include/cpython/pyerrors.h b/Include/cpython/pyerrors.h
@@ -14,6 +14,12 @@ typedef struct {
     PyException_HEAD
 } PyBaseExceptionObject;
 
+typedef struct {
+    PyException_HEAD
+    PyObject *msg;
+    PyObject *excs;
+} PyBaseExceptionGroupObject;
+
 typedef struct {
     PyException_HEAD
     PyObject *msg;

diff --git a/Include/pyerrors.h b/Include/pyerrors.h
@@ -65,6 +65,8 @@ PyAPI_FUNC(const char *) PyExceptionClass_Name(PyObject *);
 
 PyAPI_DATA(PyObject *) PyExc_BaseException;
 PyAPI_DATA(PyObject *) PyExc_Exception;
+PyAPI_DATA(PyObject *) PyExc_BaseExceptionGroup;
+PyAPI_DATA(PyObject *) PyExc_ExceptionGroup;
 #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03050000
 PyAPI_DATA(PyObject *) PyExc_StopAsyncIteration;
 #endif

diff --git a/Lib/test/exception_hierarchy.txt b/Lib/test/exception_hierarchy.txt
@@ -2,7 +2,9 @@ BaseException
  +-- SystemExit
  +-- KeyboardInterrupt
  +-- GeneratorExit
+ +-- BaseExceptionGroup
  +-- Exception
+      +-- ExceptionGroup [BaseExceptionGroup]
       +-- StopIteration
       +-- StopAsyncIteration
       +-- ArithmeticError

diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
@@ -4026,7 +4026,11 @@ def test_builtin_bases(self):
         for tp in builtin_types:
             object.__getattribute__(tp, "__bases__")
             if tp is not object:
-                self.assertEqual(len(tp.__bases__), 1, tp)
+                if tp is ExceptionGroup:
+                    num_bases = 2
+                else:
+                    num_bases = 1
+                self.assertEqual(len(tp.__bases__), num_bases, tp)
 
         class L(list):
             pass

diff --git a/Lib/test/test_doctest.py b/Lib/test/test_doctest.py
@@ -668,7 +668,7 @@ def non_Python_modules(): r"""
 
     >>> import builtins
     >>> tests = doctest.DocTestFinder().find(builtins)
-    >>> 816 < len(tests) < 836 # approximate number of objects with docstrings
+    >>> 816 < len(tests) < 840 # approximate number of objects with docstrings
     True
     >>> real_tests = [t for t in tests if len(t.examples) > 0]
     >>> len(real_tests) # objects that actually have doctests