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.

At the 1996 Summer Olympics in Atlanta, Denman placed 11th in the 100-metre breaststroke, but fellow Australian Samantha Riley won the bronze medal.

Competing in front of a partisan home crowd at the 1998 World Championships in Perth, Denman set a personal best in winning silver in the 100-metre breaststroke, pushing American Kristy Kowal to within an arm's length.

She also combined with Meredith Smith, Petria Thomas and Susie O'Neill in the final of the 4×100-metre medley relay to claim silver behind the Americans.

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.