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diff --git a/absl/types/bad_any_cast.h b/absl/types/bad_any_cast.h
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+// Copyright 2017 The Abseil Authors.
+//
+// Licensed 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.
+
+#ifndef ABSL_TYPES_BAD_ANY_CAST_H_
+#define ABSL_TYPES_BAD_ANY_CAST_H_
+
+#include <typeinfo>
+
+namespace absl {
+
+////////////////////////
+// [any.bad_any_cast] //
+////////////////////////
+
+// Objects of type bad_any_cast are thrown by a failed any_cast.
+class bad_any_cast : public std::bad_cast {
+ public:
+  ~bad_any_cast() override;
+  const char* what() const noexcept override;
+};
+
+//////////////////////////////////////////////
+// Implementation-details beyond this point //
+//////////////////////////////////////////////
+
+namespace any_internal {
+
+[[noreturn]] void ThrowBadAnyCast();
+
+}  // namespace any_internal
+}  // namespace absl
+
+#endif  // ABSL_TYPES_BAD_ANY_CAST_H_