Project Runway All Stars is an American reality television series, and a spin-off of Project Runway, featuring returning designers competing for grand prizes. Angela Lindvall and Carolyn Murphy have each hosted one season before Alyssa Milano became the staple host of the past five seasons. As on Project Runway, the designers are judged by the host, two permanent judges and guest judges throughout the season. The permanent All Stars judges have been designers Georgina Chapman and Isaac Mizrahi. Joanna Coles mentored the designers throughout seasons one and two, Zanna Roberts Rassi replaced her in season three to five and Anne Fulenwider mentored seasons six and seven.

In May, 2016, Lifetime renewed Project Runway All Stars for two more seasons (six and seven) in a deal with The Weinstein Company. Following the 2017 allegations against Harvey Weinstein, The Weinstein Company filed for bankruptcy, Project Runway was picked up by its original broadcaster Bravo. In 2023, it was announced that an All-Star season would be produced and aired by Bravo. This 2023 edition is named as the 20th season of the main show, rather than another season of a separate show.