diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index ad46a5f5f9..4cf7ab60d6 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -113,6 +113,7 @@ All definitions files include a header with the author and editors, so at some p
 * [Google Url Shortener](https://developers.google.com/url-shortener/) (by [Frank M](https://github.com/sgtfrankieboy))
 * [Hammer.js](http://eightmedia.github.com/hammer.js/) (by [Boris Yankov](https://github.com/borisyankov))
 * [Handlebars](http://handlebarsjs.com/) (by [Boris Yankov](https://github.com/borisyankov))
+* [HashMap](https://github.com/flesler/hashmap) (by [Rafał Wrzeszcz](https://wrzasq.pl))
 * [HashSet](http://www.timdown.co.uk/jshashtable/jshashset.html) (by [Sergey Gerasimov](https://github.com/gerich-home))
 * [Hashtable](http://www.timdown.co.uk/jshashtable/) (by [Sergey Gerasimov](https://github.com/gerich-home))
 * [HelloJS](http://adodson.com/hello.js) (by [Pavel Zika](https://github.com/PavelPZ))
diff --git a/hashmap/hashmap-tests.ts b/hashmap/hashmap-tests.ts
new file mode 100644
index 0000000000..4c3d74ee00
--- /dev/null
+++ b/hashmap/hashmap-tests.ts
@@ -0,0 +1,24 @@
+/// <reference path="hashmap.d.ts"/>
+
+var map : HashMap<string, number> = new HashMap<string, number>();
+
+map.set("foo", 123);
+
+var value : number = map.get("foo");
+
+map.has("foo");
+
+map.remove("foo");
+
+var keys : string[] = map.keys();
+
+var values : number[] = map.values();
+
+var count : number = map.count();
+
+map.forEach(function(value : number, key : string) : void {
+        console.log(key);
+        console.log(value);
+});
+
+map.clear();
diff --git a/hashmap/hashmap.d.ts b/hashmap/hashmap.d.ts
new file mode 100644
index 0000000000..c9f8581747
--- /dev/null
+++ b/hashmap/hashmap.d.ts
@@ -0,0 +1,71 @@
+// Type definitions for HashMap 1.1.0
+// Project: https://github.com/flesler/hashmap
+// Definitions by: Rafał Wrzeszcz <http://wrzasq.pl>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare class HashMap<KeyType, ValueType> {
+    /**
+     * Return value from hashmap.
+     *
+     * @param key Key.
+     * @return Value stored under given key.
+     */
+    get(key : KeyType) : ValueType;
+
+    /**
+     * Store value in hashmap.
+     *
+     * @param key Key.
+     * @param value Value.
+     */
+    set(key : KeyType, value : ValueType) : void;
+
+    /**
+     * Checks if given key exists in hashmap.
+     *
+     * @param key Key.
+     * @return Whether given key exists in hashmap.
+     */
+    has(key : KeyType) : boolean;
+
+    /**
+     * Removes given key from hashmap.
+     *
+     * @param key Key.
+     */
+    remove(key : KeyType) : void;
+
+    /**
+     * Returns all contained keys.
+     *
+     * @return List of keys.
+     */
+    keys() : KeyType[];
+
+    /**
+     * Returns all container values.
+     *
+     * @return List of values.
+     */
+    values() : ValueType[];
+
+    /**
+     * Returns size of hashmap (number of entries).
+     *
+     * @return Number of entries in hashmap.
+     */
+    count() : number;
+
+    /**
+     * Clears hashmap.
+     */
+    clear() : void;
+
+    /**
+     * Iterates over hashmap.
+     *
+     * @param callback Function to be invoked for every hashmap entry.
+     */
+    forEach(callback : (value : ValueType, key : KeyType) => void) : void;
+}
+