diff --git a/clang/docs/Modules.rst b/clang/docs/Modules.rst
--- a/clang/docs/Modules.rst
+++ b/clang/docs/Modules.rst
@@ -588,6 +588,9 @@
 c17
   C17 support is available.
 
+c23
+  C23 support is available.
+
 freestanding
   A freestanding environment is available.
 
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -107,6 +107,7 @@
   and the ``__STDC_VERSION__`` macro now expands to ``202311L`` instead of its
   previous placeholder value. Clang continues to accept ``-std=c2x`` and
   ``-std=gnu2x`` as aliases for C23 and GNU C23, respectively.
+- Clang now supports `requires c23` for module maps.
 
 Non-comprehensive list of changes in this release
 -------------------------------------------------
diff --git a/clang/lib/Basic/Module.cpp b/clang/lib/Basic/Module.cpp
--- a/clang/lib/Basic/Module.cpp
+++ b/clang/lib/Basic/Module.cpp
@@ -113,6 +113,7 @@
                         .Case("c99", LangOpts.C99)
                         .Case("c11", LangOpts.C11)
                         .Case("c17", LangOpts.C17)
+                        .Case("c23", LangOpts.C23)
                         .Case("freestanding", LangOpts.Freestanding)
                         .Case("gnuinlineasm", LangOpts.GNUAsm)
                         .Case("objc", LangOpts.ObjC)
diff --git a/clang/test/Modules/Inputs/DependsOnModule.framework/module.map b/clang/test/Modules/Inputs/DependsOnModule.framework/module.map
--- a/clang/test/Modules/Inputs/DependsOnModule.framework/module.map
+++ b/clang/test/Modules/Inputs/DependsOnModule.framework/module.map
@@ -64,4 +64,7 @@
   explicit module C17 {
     requires c17
   }
+  explicit module C23 {
+    requires c23
+  }
 }
diff --git a/clang/test/Modules/requires.m b/clang/test/Modules/requires.m
--- a/clang/test/Modules/requires.m
+++ b/clang/test/Modules/requires.m
@@ -35,4 +35,6 @@
 @import DependsOnModule.C11; // expected-note {{module imported here}}
 // expected-error@DependsOnModule.framework/module.map:64 {{module 'DependsOnModule.C17' requires feature 'c17'}}
 @import DependsOnModule.C17; // expected-note {{module imported here}}
+// expected-error@DependsOnModule.framework/module.map:67 {{module 'DependsOnModule.C23' requires feature 'c23'}}
+@import DependsOnModule.C23; // expected-note {{module imported here}}
 #endif