diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -3360,11 +3360,18 @@
 
   while (FormatTok->Tok.getIdentifierInfo() ||
          FormatTok->isOneOf(tok::colon, tok::coloncolon, tok::less,
-                            tok::greater, tok::comma, tok::question)) {
+                            tok::greater, tok::comma, tok::question,
+                            tok::l_square, tok::r_square)) {
     nextToken();
     // We can have macros or attributes in between 'enum' and the enum name.
     if (FormatTok->is(tok::l_paren))
       parseParens();
+    if (FormatTok->is(TT_AttributeSquare)) {
+      parseSquare();
+      // Consume the closing TT_AttributeSquare.
+      if (FormatTok->Next && FormatTok->is(TT_AttributeSquare))
+        nextToken();
+    }
     if (FormatTok->is(tok::identifier)) {
       nextToken();
       // If there are two identifiers in a row, this is likely an elaborate
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -3565,6 +3565,7 @@
   verifyFormat("enum X E {} d;");
   verifyFormat("enum __attribute__((...)) E {} d;");
   verifyFormat("enum __declspec__((...)) E {} d;");
+  verifyFormat("enum [[nodiscard]] E {} d;");
   verifyFormat("enum {\n"
                "  Bar = Foo<int, int>::value\n"
                "};",
@@ -3658,6 +3659,7 @@
   verifyFormat("enum struct X E {} d;");
   verifyFormat("enum struct __attribute__((...)) E {} d;");
   verifyFormat("enum struct __declspec__((...)) E {} d;");
+  verifyFormat("enum struct [[nodiscard]] E {} d;");
   verifyFormat("enum struct X f() {\n  a();\n  return 42;\n}");
 }
 
@@ -3675,6 +3677,7 @@
   verifyFormat("enum class X E {} d;");
   verifyFormat("enum class __attribute__((...)) E {} d;");
   verifyFormat("enum class __declspec__((...)) E {} d;");
+  verifyFormat("enum class [[nodiscard]] E {} d;");
   verifyFormat("enum class X f() {\n  a();\n  return 42;\n}");
 }