The HTC HD2 is a mobile telephone running the Windows Mobile operating system. The phone was designed and manufactured by HTC, and was released in Europe in November 2009, and in December 2009 in Hong Kong. In some other regions, including North America, it was released March 2010.

It is the first smartphone with a 4.3-inch touchscreen, the first Windows Mobile phone with a multi-touch capacitive screen and HTC Sense, and the second smartphone with a Snapdragon ARM CPU (the first being the Toshiba TG01). HTC also officially sells an optional stylus pen for the HD2 to aid navigation through the interface.  Some Windows Mobile applications were designed to be used with a stylus, rather than finger-touch, and still need a stylus pen to be used effectively. Windows Phone 7 was thought to have been unofficially ported to the HD2, but it was later demonstrated as easy to fake with the use of a Remote Terminal connection.

Certain T-Mobile locations are running a promotion that states that iPhone users who turn in their handsets can get anywhere from $100 to $350 dollars off the HD2.

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