diff --git a/Doc/c-api/init.rst b/Doc/c-api/init.rst
index bb9e08acee14c2..379330f380400f 100644
--- a/Doc/c-api/init.rst
+++ b/Doc/c-api/init.rst
@@ -41,7 +41,6 @@ The following functions can be safely called before Python is initialized:
   * :c:func:`PyObject_SetArenaAllocator`
   * :c:func:`Py_SetProgramName`
   * :c:func:`Py_SetPythonHome`
-  * :c:func:`PySys_ResetWarnOptions`
   * the configuration functions covered in :ref:`init-config`
 
 * Informative functions:
diff --git a/Doc/c-api/sys.rst b/Doc/c-api/sys.rst
index b34936dd55e94c..9a5e26d231cc0c 100644
--- a/Doc/c-api/sys.rst
+++ b/Doc/c-api/sys.rst
@@ -316,14 +316,6 @@ accessible to C code.  They all work with the current interpreter thread's
    case *name* is deleted from the sys module. Returns ``0`` on success, ``-1``
    on error.
 
-.. c:function:: void PySys_ResetWarnOptions()
-
-   Reset :data:`sys.warnoptions` to an empty list. This function may be
-   called prior to :c:func:`Py_Initialize`.
-
-   .. deprecated-removed:: 3.13 3.15
-      Clear :data:`sys.warnoptions` and :data:`!warnings.filters` instead.
-
 .. c:function:: void PySys_WriteStdout(const char *format, ...)
 
    Write the output string described by *format* to :data:`sys.stdout`.  No
diff --git a/Doc/data/stable_abi.dat b/Doc/data/stable_abi.dat
index 641f7bb3804471..3f51254494c654 100644
--- a/Doc/data/stable_abi.dat
+++ b/Doc/data/stable_abi.dat
@@ -637,7 +637,6 @@ func,PySys_GetObject,3.2,,
 func,PySys_GetOptionalAttr,3.15,,
 func,PySys_GetOptionalAttrString,3.15,,
 func,PySys_GetXOptions,3.7,,
-func,PySys_ResetWarnOptions,3.2,,
 func,PySys_SetArgv,3.2,,
 func,PySys_SetArgvEx,3.2,,
 func,PySys_SetObject,3.2,,
diff --git a/Doc/deprecations/c-api-pending-removal-in-3.15.rst b/Doc/deprecations/c-api-pending-removal-in-3.15.rst
index a3e335ecaf4324..8db3631cab31f1 100644
--- a/Doc/deprecations/c-api-pending-removal-in-3.15.rst
+++ b/Doc/deprecations/c-api-pending-removal-in-3.15.rst
@@ -59,7 +59,7 @@ Pending removal in Python 3.15
     Set :c:member:`PyConfig.program_name` instead.
   * :c:func:`!Py_SetPythonHome()`:
     Set :c:member:`PyConfig.home` instead.
-  * :c:func:`PySys_ResetWarnOptions`:
+  * :c:func:`!PySys_ResetWarnOptions`:
     Clear :data:`sys.warnoptions` and :data:`!warnings.filters` instead.
 
   The :c:func:`Py_InitializeFromConfig` API should be used with
diff --git a/Doc/whatsnew/3.13.rst b/Doc/whatsnew/3.13.rst
index 6545da66afc4fc..67fec4ebc4a234 100644
--- a/Doc/whatsnew/3.13.rst
+++ b/Doc/whatsnew/3.13.rst
@@ -2490,7 +2490,7 @@ Deprecated C APIs
 
 * Deprecate old Python initialization functions:
 
-  * :c:func:`PySys_ResetWarnOptions`:
+  * :c:func:`!PySys_ResetWarnOptions`:
     Clear :data:`sys.warnoptions` and :data:`!warnings.filters` instead.
   * :c:func:`!Py_GetExecPrefix`:
     Get :data:`sys.exec_prefix` instead.
diff --git a/Doc/whatsnew/3.15.rst b/Doc/whatsnew/3.15.rst
index 1d029e3914baf5..2ff8eb21dce2e9 100644
--- a/Doc/whatsnew/3.15.rst
+++ b/Doc/whatsnew/3.15.rst
@@ -800,6 +800,11 @@ Removed C APIs
   of :c:func:`PyImport_ImportModule`.
   (Contributed by Bénédikt Tran in :gh:`133644`.)
 
+* Remove deprecated :c:func:`!PySys_ResetWarnOptions`.
+  Clear :data:`sys.warnoptions` and :data:`!warnings.filters` instead.
+
+  (Contributed by Nikita Sobolev in :gh:`138886`.)
+
 The following functions are removed in favor of :c:func:`PyConfig_Get`.
 The |pythoncapi_compat_project| can be used to get :c:func:`!PyConfig_Get`
 on Python 3.13 and older.
diff --git a/Include/sysmodule.h b/Include/sysmodule.h
index 2f362791797ded..b7d800c5e5db0b 100644
--- a/Include/sysmodule.h
+++ b/Include/sysmodule.h
@@ -23,8 +23,6 @@ PyAPI_FUNC(void) PySys_WriteStderr(const char *format, ...)
 PyAPI_FUNC(void) PySys_FormatStdout(const char *format, ...);
 PyAPI_FUNC(void) PySys_FormatStderr(const char *format, ...);
 
-Py_DEPRECATED(3.13) PyAPI_FUNC(void) PySys_ResetWarnOptions(void);
-
 PyAPI_FUNC(PyObject *) PySys_GetXOptions(void);
 
 #ifdef __cplusplus
diff --git a/Misc/NEWS.d/3.13.0a1.rst b/Misc/NEWS.d/3.13.0a1.rst
index 0741eab4eca6a4..a3aa7353a1bba1 100644
--- a/Misc/NEWS.d/3.13.0a1.rst
+++ b/Misc/NEWS.d/3.13.0a1.rst
@@ -6592,7 +6592,7 @@ functions, deprecated in Python 3.9. Patch by Victor Stinner.
 
 Deprecate old Python initialization functions:
 
-* :c:func:`PySys_ResetWarnOptions`
+* :c:func:`!PySys_ResetWarnOptions`
 * :c:func:`!Py_GetExecPrefix`
 * :c:func:`!Py_GetPath`
 * :c:func:`!Py_GetPrefix`
diff --git a/Misc/NEWS.d/next/C_API/2025-09-14-13-09-47.gh-issue-138886.dlcTXL.rst b/Misc/NEWS.d/next/C_API/2025-09-14-13-09-47.gh-issue-138886.dlcTXL.rst
new file mode 100644
index 00000000000000..a77f42977abb79
--- /dev/null
+++ b/Misc/NEWS.d/next/C_API/2025-09-14-13-09-47.gh-issue-138886.dlcTXL.rst
@@ -0,0 +1 @@
+Remove deprecated :c:func:`!PySys_ResetWarnOptions` C-API function.
diff --git a/Misc/stable_abi.toml b/Misc/stable_abi.toml
index bc0fab48528115..d651e0fac111b1 100644
--- a/Misc/stable_abi.toml
+++ b/Misc/stable_abi.toml
@@ -1335,6 +1335,7 @@
     abi_only = true
 [function.PySys_ResetWarnOptions]
     added = '3.2'
+    abi_only = true
 [function.PySys_SetArgv]
     added = '3.2'
 [function.PySys_SetArgvEx]
diff --git a/Programs/_testembed.c b/Programs/_testembed.c
index 28c004c3c5ac2c..4f5a14b8ca6c80 100644
--- a/Programs/_testembed.c
+++ b/Programs/_testembed.c
@@ -22,6 +22,10 @@ extern void PySys_AddWarnOption(const wchar_t *s);
 extern void PySys_AddXOption(const wchar_t *s);
 extern void Py_SetPath(const wchar_t *path);
 
+// These functions were removed from Python 3.15 API but are still exported
+// for the stable ABI. We want to test them in this program.
+extern void PySys_ResetWarnOptions(void);
+
 
 int main_argc;
 char **main_argv;
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 832d2afff806ab..59baca26793f6c 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -3045,7 +3045,7 @@ get_warnoptions(PyThreadState *tstate)
     return warnoptions;
 }
 
-void
+PyAPI_FUNC(void)
 PySys_ResetWarnOptions(void)
 {
     PyThreadState *tstate = _PyThreadState_GET();