Jay McCarroll (born October 11, 1974) is a fashion designer who gained fame after winning the debut season of the competitive reality show Project Runway in 2005.

When McCarroll won the show's first season, becoming the only winner so far to never win a challenge, he was awarded $100,000, a mentorship from Banana Republic, and a spot in the prestigious 2005 New York Fashion Week event.

However, Jay turned down the money and the mentorship,[2] citing a contractual clause stipulating that the Project Runway production company would own a 10% stake of all his professional ventures in perpetuity.

[8] In an episode aired on 5 April 2010, McCarroll won the seventh season of Celebrity Fit Club on VH1, having lost 40 pounds over the course of his time on the program.

In February 2020 McCarroll was employed in the wardrobe department of the television series Mare of Easttown, coordinating clothing for background extras.