diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -220,7 +220,11 @@
   SystemConfigDir = CLANG_CONFIG_FILE_SYSTEM_DIR;
 #endif
 #if defined(CLANG_CONFIG_FILE_USER_DIR)
-  UserConfigDir = CLANG_CONFIG_FILE_USER_DIR;
+  {
+    SmallString<128> P;
+    llvm::sys::fs::expand_tilde(CLANG_CONFIG_FILE_USER_DIR, P);
+    UserConfigDir = static_cast<std::string>(P);
+  }
 #endif
 
   // Compute the path to the resource directory.
@@ -1008,8 +1012,8 @@
     }
     if (CLOptions->hasArg(options::OPT_config_user_dir_EQ)) {
       SmallString<128> CfgDir;
-      CfgDir.append(
-          CLOptions->getLastArgValue(options::OPT_config_user_dir_EQ));
+      llvm::sys::fs::expand_tilde(
+          CLOptions->getLastArgValue(options::OPT_config_user_dir_EQ), CfgDir);
       if (CfgDir.empty() || getVFS().makeAbsolute(CfgDir))
         UserConfigDir.clear();
       else
diff --git a/clang/test/Driver/config-file3.c b/clang/test/Driver/config-file3.c
--- a/clang/test/Driver/config-file3.c
+++ b/clang/test/Driver/config-file3.c
@@ -221,3 +221,8 @@
 //
 // RUN: rm %t/testdmode/clang-g++.cfg
 // RUN: %t/testdmode/x86_64-unknown-linux-gnu-clang-g++ --config-system-dir= --config-user-dir= -no-canonical-prefixes --version 2>&1 | FileCheck %s -check-prefix NO-CONFIG
+
+//--- Tilde expansion in user configuration file directory
+//
+// RUN: HOME=%S/Inputs/config %clang --config-user-dir=~ -v 2>&1 | FileCheck %s -check-prefix CHECK-TILDE
+// CHECK-TILDE: User configuration file directory: {{.*}}/Inputs/config