The HTC Desire HD (codenamed: "HTC Ace") is an Android smartphone by HTC Corporation. It was unveiled in an event in London hosted by HTC on September 15, 2010, and available for sale from mid October.

The smartphone has an aluminum uni-body design with the Android 2.2 "Froyo" operating system and customised HTC Sense user interface. It features a 4.3-inch WVGA LCD capacitive touchscreen, 8 megapixel camera (capable of 720p video) and support for HSPA/W-CDMA and quad-band GSM/GPRS/EDGE.

It is the first phone to use the 1 GHz MSM8255 Scorpion CPU. This second generation Snapdragon processor uses a low-power 45 nm process technology for higher integration and efficiency, and more than doubles the performance of the Adreno 200 GPU. This allows for longer talk and standby times than the original HTC Desire even with a smaller capacity battery. Phone start-up time has also been improved from more than 40 seconds to less than 10 seconds under certain circumstances.

The HTC Desire HD has 768 MB RAM and 1.5 GB (internal) memory. Memory capacity can be further enhanced by up to 32 GB with a micro SDHC memory card.