diff --git a/modules/rostests/apitests/kernel32/CMakeLists.txt b/modules/rostests/apitests/kernel32/CMakeLists.txt
index 8ff3f8627be..36e806021fa 100644
--- a/modules/rostests/apitests/kernel32/CMakeLists.txt
+++ b/modules/rostests/apitests/kernel32/CMakeLists.txt
@@ -17,6 +17,7 @@ list(APPEND SOURCE
     GetCPInfo.c
     GetCurrentDirectory.c
     GetDriveType.c
+    GetLocaleInfo.c
     GetModuleFileName.c
     GetVolumeInformation.c
     InitOnce.c
diff --git a/modules/rostests/apitests/kernel32/GetLocaleInfo.c b/modules/rostests/apitests/kernel32/GetLocaleInfo.c
new file mode 100644
index 00000000000..29e0b375a93
--- /dev/null
+++ b/modules/rostests/apitests/kernel32/GetLocaleInfo.c
@@ -0,0 +1,90 @@
+/*
+ * PROJECT:         ReactOS api tests
+ * LICENSE:         GPLv2+ - See COPYING in the top level directory
+ * PURPOSE:         Test for GetLocaleInfo(Ex)
+ * PROGRAMMER:      Timo Kreuzer <timo.kreuzer@reactos.org>
+ */
+
+#include "precomp.h"
+
+typedef
+int
+WINAPI
+FN_GetLocaleInfoEx(
+    _In_opt_ LPCWSTR lpLocaleName,
+    _In_ LCTYPE  LCType,
+    _Out_opt_ LPWSTR lpLCData,
+    _In_ int cchData);
+
+FN_GetLocaleInfoEx* pGetLocaleInfoEx = NULL;
+
+static void Test_GetLocaleInfoEx(void)
+{
+    HMODULE hmodKernel32;
+    int Ret;
+    ULONG CodePage;
+
+    hmodKernel32 = GetModuleHandleW(L"kernel32.dll");
+    pGetLocaleInfoEx = (FN_GetLocaleInfoEx*)GetProcAddress(hmodKernel32, "GetLocaleInfoEx");
+    if (pGetLocaleInfoEx == NULL)
+    {
+        hmodKernel32 = LoadLibraryW(L"kernel32_vista.dll");
+        pGetLocaleInfoEx = (FN_GetLocaleInfoEx*)GetProcAddress(hmodKernel32, "GetLocaleInfoEx");
+        if (pGetLocaleInfoEx == NULL)
+        {
+            skip("GetLocaleInfoEx not found in kernel32.dll\n");
+            return;
+        }
+    }
+
+    // Test normal usage
+    Ret = pGetLocaleInfoEx(L"en-US",
+                           LOCALE_IDEFAULTANSICODEPAGE | LOCALE_RETURN_NUMBER,
+                           (WCHAR*)&CodePage,
+                           sizeof(DWORD) / sizeof(WCHAR));
+    ok_eq_int(Ret, 2);
+    ok_eq_long(CodePage, 1252ul);
+
+    // Test with neutral locale
+    Ret = pGetLocaleInfoEx(L"en",
+                           LOCALE_IDEFAULTANSICODEPAGE | LOCALE_RETURN_NUMBER,
+                           NULL,
+                           0);
+    ok_eq_int(Ret, 2);
+    ok_eq_long(CodePage, 1252ul);
+
+    // Test with NULL locale name
+    CodePage = 0xdeadbeef;
+    Ret = pGetLocaleInfoEx(NULL,
+                           LOCALE_IDEFAULTANSICODEPAGE | LOCALE_RETURN_NUMBER,
+                           (WCHAR *)&CodePage,
+                           sizeof(DWORD) /sizeof(WCHAR));
+    ok_eq_int(Ret, 2);
+    ok_eq_long(CodePage, 1252ul);
+
+    // Test with empty locale name
+    CodePage = 0xdeadbeef;
+    Ret = pGetLocaleInfoEx(L"",
+                           LOCALE_IDEFAULTANSICODEPAGE | LOCALE_RETURN_NUMBER,
+                           (WCHAR *)&CodePage,
+                           sizeof(DWORD) /sizeof(WCHAR));
+    ok_eq_int(Ret, 2);
+    ok_eq_long(CodePage, 1252ul);
+
+    // Test with invalid locale name
+    CodePage = 0xdeadbeef;
+    Ret = pGetLocaleInfoEx(L"invalid",
+                           LOCALE_IDEFAULTANSICODEPAGE | LOCALE_RETURN_NUMBER,
+                           (WCHAR *)&CodePage,
+                           sizeof(DWORD) /sizeof(WCHAR));
+    ok_eq_int(Ret, 0);
+    ok_eq_long(GetLastError(), (ULONG)ERROR_INVALID_PARAMETER);
+    ok(CodePage == 0xdeadbeef, "CodePage should not have been modified: %lx\n", CodePage);
+
+}
+
+#undef GetLocaleInfo
+START_TEST(GetLocaleInfo)
+{
+    Test_GetLocaleInfoEx();
+}
diff --git a/modules/rostests/apitests/kernel32/testlist.c b/modules/rostests/apitests/kernel32/testlist.c
index e2e1735456f..c0cba1ba2f5 100644
--- a/modules/rostests/apitests/kernel32/testlist.c
+++ b/modules/rostests/apitests/kernel32/testlist.c
@@ -17,6 +17,7 @@ extern void func_GetComputerNameEx(void);
 extern void func_GetCPInfo(void);
 extern void func_GetCurrentDirectory(void);
 extern void func_GetDriveType(void);
+extern void func_GetLocaleInfo(void);
 extern void func_GetModuleFileName(void);
 extern void func_GetVolumeInformation(void);
 extern void func_InitOnce(void);
@@ -57,6 +58,7 @@ const struct test winetest_testlist[] =
     { "GetCPInfo",                   func_GetCPInfo },
     { "GetCurrentDirectory",         func_GetCurrentDirectory },
     { "GetDriveType",                func_GetDriveType },
+    { "GetLocaleInfo",               func_GetLocaleInfo },
     { "GetModuleFileName",           func_GetModuleFileName },
     { "GetVolumeInformation",        func_GetVolumeInformation },
     { "InitOnce",                    func_InitOnce },