Dyana Jane Calub (born 28 November 1975) is an Australian former backstroke swimmer of the 2000s, who won the silver medal in the 4×100-metre medley relay at the 2000 Summer Olympics in Sydney.

Training at Kingscliff, New South Wales, Calub, first gained international selection after winning the 100- and 200-metre backstroke at the 2000 Australian Championships.

At the Olympics, she combined with Leisel Jones, Susie O'Neill and Petria Thomas to register a silver medal in the 4×100-metre medley relay, trailing the Americans home by 3 seconds.

In 2001 at the 2001 World Aquatics Championships, Calub combined with Jones, Thomas and Sarah Ryan to win the 4×100-metre medley relay, the first time that Australia swimmers had defeated a United States team in the event at international competition.

This was repeated at the 2002 Pan Pacific Swimming Championships in Yokohama, where she combined with Jones, Thomas and Jodie Henry.