diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index dfe5ef0726ff7d..e1da9e5d70aaf0 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -1589,6 +1589,7 @@ or `the MSDN <https://msdn.microsoft.com/en-us/library/z0kc8e3z.aspx>`_ on Windo
    - :data:`RWF_DSYNC`
    - :data:`RWF_SYNC`
    - :data:`RWF_APPEND`
+   - :data:`RWF_ATOMIC`
 
    Return the total number of bytes actually written.
 
@@ -1638,6 +1639,16 @@ or `the MSDN <https://msdn.microsoft.com/en-us/library/z0kc8e3z.aspx>`_ on Windo
    .. versionadded:: 3.10
 
 
+.. data:: RWF_ATOMIC
+
+   Ensure the atomicity of :func:`os.pwritev` write operation. The behavior of
+   :data:`RWF_ATOMIC` will not take effect on unsupported hardware or file systems.
+
+   .. availability:: Linux >= 6.11.
+
+   .. versionadded:: next
+
+
 .. function:: read(fd, n, /)
 
    Read at most *n* bytes from file descriptor *fd*.
diff --git a/Misc/NEWS.d/next/Library/2024-12-13-21-55-13.gh-issue-127921.ESmy45.rst b/Misc/NEWS.d/next/Library/2024-12-13-21-55-13.gh-issue-127921.ESmy45.rst
new file mode 100644
index 00000000000000..4bf0a71cb094b7
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-12-13-21-55-13.gh-issue-127921.ESmy45.rst
@@ -0,0 +1 @@
+Add the :data:`~os.RWF_ATOMIC` constant to the :mod:`os` module.
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 6eb7054b566e3f..6b0393b81794f3 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -17468,6 +17468,9 @@ all_ins(PyObject *m)
 #ifdef RWF_APPEND
     if (PyModule_AddIntConstant(m, "RWF_APPEND", RWF_APPEND)) return -1;
 #endif
+#ifdef RWF_ATOMIC
+    if (PyModule_AddIntConstant(m, "RWF_ATOMIC", RWF_ATOMIC)) return -1;
+#endif
 
 /* constants for splice */
 #if defined(HAVE_SPLICE) && defined(__linux__)