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diff --git a/include/EASTL/unordered_set.h b/include/EASTL/unordered_set.h
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+///////////////////////////////////////////////////////////////////////////////
+// Copyright (c) Electronic Arts Inc. All rights reserved.
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef EASTL_UNORDERED_SET_H
+#define EASTL_UNORDERED_SET_H
+
+#include <EASTL/internal/config.h>
+#include <EASTL/hash_set.h>
+
+#if defined(EA_PRAGMA_ONCE_SUPPORTED)
+	#pragma once // Some compilers (e.g. VC++) benefit significantly from using this. We've measured 3-4% build speed improvements in apps as a result.
+#endif
+
+namespace eastl
+{
+
+	/// unordered_set 
+	///
+	/// The original TR1 (technical report 1) used "hash_set" to name a hash
+	/// table backed associative container of unique "Key" type objects.  When
+	/// the container was added to the C++11 standard the committee chose the
+	/// name "unordered_set" to clarify that internally the elements are NOT
+	/// sorted in any particular order.  We provide a template alias here to
+	/// ensure feature parity with the original eastl::hash_set.
+	///
+	#if !defined(EA_COMPILER_NO_TEMPLATE_ALIASES)
+		template <typename Value,
+				  typename Hash = eastl::hash<Value>,
+				  typename Predicate = eastl::equal_to<Value>,
+				  typename Allocator = EASTLAllocatorType,
+				  bool bCacheHashCode = false>
+		using unordered_set = hash_set<Value, Hash, Predicate, Allocator, bCacheHashCode>;
+	#endif
+
+    /// unordered_multiset 
+	///
+	/// Similar template alias as "unordered_set" except the contained elements
+	/// need not be unique. See "hash_multiset" for more details. 
+	///
+	#if !defined(EA_COMPILER_NO_TEMPLATE_ALIASES)
+		template <typename Value,
+				  typename Hash = eastl::hash<Value>,
+				  typename Predicate = eastl::equal_to<Value>,
+				  typename Allocator = EASTLAllocatorType,
+				  bool bCacheHashCode = false>
+		using unordered_multiset = hash_multiset<Value, Hash, Predicate, Allocator, bCacheHashCode>;
+	#endif
+
+} // namespace eastl
+
+#endif // Header include guard
+