HGTV Design Star is an American reality competition show that airs on the cable television network HGTV. It premiered Sunday, July 23, 2006 and aired new episodes on HGTV every Sunday night at 9 PM Eastern Daylight Time/Pacific Daylight Time, with encore presentations Thursdays at 8 PM E/P and Saturdays at 6 PM E/P.

The show is hosted by Clive Pearse. Vern Yip, host of Deserving Design; Genevieve Gorder, host of Dear Genevieve; and Candice Olson, host of Divine Design, currently serve as the show's three judges. Previous judges include Cynthia Rowley, a designer of fashion and home accessories, and Martha McCully, executive editor of the magazine InStyle.

Each week the remaining contestants participate in an interior design challenge such as designing a living space or creating a space in empty room using unconventional items from a pet store, mechanics store, or a discount store. The designers are given a specified amount of time to complete each project, as well as a specified amount of cash in order to create a design to be judged.