Helen Jennifer Denman (born 4 September 1976) is an Australian breaststroke swimmer of the 1990s, who won a silver medal in the 4×100-metre medley relay at the 1996 Summer Olympics. She won an individual silver medal in the 100-metre breaststroke at the 1998 World Aquatics Championships. At the 1998 Commonwealth Games in Kuala Lumpur, Malaysia, Denman claimed gold in the 100 m breaststroke and the 4×100-metre medley relay. In 1999 she was omitted from the Australian national team, and in 2000 she made an unsuccessful attempt to qualify for the 2000 Summer Olympics in Sydney.