Yseult Gervy (born 20 January 1979) is a retired Belgian swimmer who won the bronze medal in the 400 m medley at the 2000 European Aquatics Championships. She also competed in the 1996 and 2000 Summer Olympics in the 100 m and 200 m backstroke, 200 m and 400 m medley, and 4×200 m freestyle relay events. Her best Olympic achievement was 12th place in the relay.