Gary O'Toole, M.D., is a retired Irish Olympic swimmer. He represented Ireland at the Seoul, and Barcelona Games. While studying at University College Dublin, O'Toole won a 200 m breaststroke silver medal at the 1989 European Long Course Championships in Bonn . He also won a gold medal at the World University Championships in 1991 when representing University College Dublin and UCD. He helped to break 5 National relay records, including Short Course and Longcourse.