diff --git a/Include/internal/pycore_critical_section.h b/Include/internal/pycore_critical_section.h
index 7bebcdb67c7169..b3d15cc1b856b9 100644
--- a/Include/internal/pycore_critical_section.h
+++ b/Include/internal/pycore_critical_section.h
@@ -98,6 +98,8 @@ extern "C" {
 # define Py_END_CRITICAL_SECTION()                                      \
         _PyCriticalSection_End(&_cs);                                   \
     }
+# define Py_EXIT_CRITICAL_SECTION()                                     \
+        _PyCriticalSection_End(&_cs);
 
 # define Py_BEGIN_CRITICAL_SECTION2(a, b)                               \
     {                                                                   \
@@ -156,6 +158,7 @@ extern "C" {
 # define Py_BEGIN_CRITICAL_SECTION(op)
 # define Py_END_CRITICAL_SECTION()
 # define Py_BEGIN_CRITICAL_SECTION2(a, b)
+# define Py_EXIT_CRITICAL_SECTION()
 # define Py_END_CRITICAL_SECTION2()
 # define Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST(original)
 # define Py_END_CRITICAL_SECTION_SEQUENCE_FAST()
diff --git a/Misc/NEWS.d/next/Core and Builtins/2024-06-16-22-42-47.gh-issue-120608._-YtWX.rst b/Misc/NEWS.d/next/Core and Builtins/2024-06-16-22-42-47.gh-issue-120608._-YtWX.rst
new file mode 100644
index 00000000000000..76e018eeefbcfa
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2024-06-16-22-42-47.gh-issue-120608._-YtWX.rst	
@@ -0,0 +1 @@
+Make :func:`reversed` thread-safe.
diff --git a/Objects/enumobject.c b/Objects/enumobject.c
index 556666779d8522..668166c3a2dd20 100644
--- a/Objects/enumobject.c
+++ b/Objects/enumobject.c
@@ -2,6 +2,7 @@
 
 #include "Python.h"
 #include "pycore_call.h"          // _PyObject_CallNoArgs()
+#include "pycore_critical_section.h" // Py_BEGIN_CRITICAL_SECTION()
 #include "pycore_long.h"          // _PyLong_GetOne()
 #include "pycore_modsupport.h"    // _PyArg_NoKwnames()
 #include "pycore_object.h"        // _PyObject_GC_TRACK()
@@ -431,16 +432,20 @@ reversed_next(reversedobject *ro)
     PyObject *item;
     Py_ssize_t index = ro->index;
 
+    Py_BEGIN_CRITICAL_SECTION(ro);
     if (index >= 0) {
         item = PySequence_GetItem(ro->seq, index);
         if (item != NULL) {
             ro->index--;
+            Py_EXIT_CRITICAL_SECTION();
             return item;
         }
         if (PyErr_ExceptionMatches(PyExc_IndexError) ||
             PyErr_ExceptionMatches(PyExc_StopIteration))
             PyErr_Clear();
     }
+    Py_END_CRITICAL_SECTION();
+
     ro->index = -1;
     Py_CLEAR(ro->seq);
     return NULL;