Anthony Kostelac (born July 4, 1991) is a middle-distance runner who specializes in the 800 meters. As a high schooler, he was a part of Albemarle High School's men's 4×800 meter relay team which broke a world junior record in 2012. He went on to compete as an 800-meter runner with University of Virginia, in addition to building a reputation as a prolific relay runner.