diff --git a/include/locale.h b/include/locale.h
index 742dd0f5d32..228e1342c2a 100644
--- a/include/locale.h
+++ b/include/locale.h
@@ -117,6 +117,7 @@ locale_t duplocale(locale_t locobj);
 void freelocale(locale_t locobj);
 
 locale_t uselocale(locale_t newloc);
+FAR const char *getlocalename_l(int category, locale_t locobj);
 
 #undef EXTERN
 #ifdef __cplusplus
diff --git a/libs/libc/locale/CMakeLists.txt b/libs/libc/locale/CMakeLists.txt
index 6c6f530366f..d684943d1fb 100644
--- a/libs/libc/locale/CMakeLists.txt
+++ b/libs/libc/locale/CMakeLists.txt
@@ -33,5 +33,6 @@ if(CONFIG_LIBC_LOCALE)
             lib_gettext.c
             lib_langinfo.c
             lib_iconv.c
-            lib_maxlocale.c)
+            lib_maxlocale.c
+            lib_getlocalename_l.c)
 endif()
diff --git a/libs/libc/locale/Make.defs b/libs/libc/locale/Make.defs
index ddd27c9427a..0e8737f6d07 100644
--- a/libs/libc/locale/Make.defs
+++ b/libs/libc/locale/Make.defs
@@ -27,7 +27,7 @@ ifeq ($(CONFIG_LIBC_LOCALE),y)
 CSRCS += lib_duplocale.c lib_freelocale.c lib_localeconv.c
 CSRCS += lib_newlocale.c lib_setlocale.c lib_uselocale.c
 CSRCS += lib_catalog.c lib_gettext.c lib_langinfo.c lib_iconv.c
-CSRCS += lib_maxlocale.c
+CSRCS += lib_maxlocale.c lib_getlocalename_l.c
 
 # Add the locale directory to the build
 
diff --git a/libs/libc/locale/lib_getlocalename_l.c b/libs/libc/locale/lib_getlocalename_l.c
new file mode 100644
index 00000000000..3582ee5fb34
--- /dev/null
+++ b/libs/libc/locale/lib_getlocalename_l.c
@@ -0,0 +1,67 @@
+/****************************************************************************
+ * libs/libc/locale/lib_getlocalename_l.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+#include <locale.h>
+#include <stddef.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: getlocalename_l
+ *
+ * Description:
+ *   Return the name of the locale of one category of a locale object
+ *   (POSIX.1-2024).  LC_GLOBAL_LOCALE means the global locale.  NuttX
+ *   supports only the "C" locale, so every category of every locale is
+ *   "C".
+ *
+ * Input Parameters:
+ *   category - LC_CTYPE, LC_NUMERIC, ... (not LC_ALL)
+ *   locobj   - A locale object, or LC_GLOBAL_LOCALE
+ *
+ * Returned Value:
+ *   The name of the locale, or NULL with errno set to EINVAL if the
+ *   category is not valid.
+ *
+ ****************************************************************************/
+
+FAR const char *getlocalename_l(int category, locale_t locobj)
+{
+  UNUSED(locobj);
+
+  if (category < 0 || category >= LC_ALL)
+    {
+      set_errno(EINVAL);
+      return NULL;
+    }
+
+  return "C";
+}