Simon John Dennis MBE (born 24 August 1976) is a British rower and Olympic gold medalist. Dennis was born in Henley-on-Thames, Oxfordshire. He started rowing at St Paul's School, London, coached by Michael Streat and his first international appearance was in 1994 in the GB eight at the World Rowing Junior Championships, winning a bronze medal. After school he attended Imperial College London, winning two Henley Royal Regatta races with them.He raced in the eight at the World Championships in 1997 and 1998, before rowing with Steve Williams in the coxless pair for the 1999 season, winning the Silver Goblets and Nickall's Challenge cup at Henley. In 2000 he returned to the men's eight which won a gold medal at the Sydney Olympics. He is now a teacher of Biology at Marlborough College in Wiltshire.