diff --git a/news/12797.vendor.rst b/news/12797.vendor.rst
new file mode 100644
index 00000000000..7842883ddba
--- /dev/null
+++ b/news/12797.vendor.rst
@@ -0,0 +1 @@
+Use tomllib from the stdlib if available, rather than tomli
diff --git a/src/pip/_internal/pyproject.py b/src/pip/_internal/pyproject.py
index 8de36b873ed..b9b9e3f19d9 100644
--- a/src/pip/_internal/pyproject.py
+++ b/src/pip/_internal/pyproject.py
@@ -1,9 +1,14 @@
 import importlib.util
 import os
+import sys
 from collections import namedtuple
 from typing import Any, List, Optional
 
-from pip._vendor import tomli
+if sys.version_info >= (3, 11):
+    import tomllib
+else:
+    from pip._vendor import tomli as tomllib
+
 from pip._vendor.packaging.requirements import InvalidRequirement, Requirement
 
 from pip._internal.exceptions import (
@@ -61,7 +66,7 @@ def load_pyproject_toml(
 
     if has_pyproject:
         with open(pyproject_toml, encoding="utf-8") as f:
-            pp_toml = tomli.loads(f.read())
+            pp_toml = tomllib.loads(f.read())
         build_system = pp_toml.get("build-system")
     else:
         build_system = None
diff --git a/src/pip/_vendor/__init__.py b/src/pip/_vendor/__init__.py
index 50537ab9de1..748622eaf19 100644
--- a/src/pip/_vendor/__init__.py
+++ b/src/pip/_vendor/__init__.py
@@ -111,6 +111,7 @@ def vendored(modulename):
     vendored("rich.text")
     vendored("rich.traceback")
     vendored("tenacity")
-    vendored("tomli")
+    if sys.version_info < (3, 11):
+        vendored("tomli")
     vendored("truststore")
     vendored("urllib3")