DeWayne Barrett (born December 27, 1981) is a Jamaican sprinter who specializes in the 400 meters. He won a silver medal in the relay at the 2008 World Indoor Championships in Valencia, along with Michael Blackwood, Edino Steele, and Adrian Findlay. He also won a silver medal in the 2005 Summer Universiade in the 400 m.
He attended St. John's University in New York City, and graduated in 2005.