Joanna Lindsay Fargus (born 3 January 1982) is a British-Australian former swimmer who specialised in the 200-metre backstroke. In this event she won a gold medal at the 2006 Commonwealth Games in Melbourne, and at the European Short Course Swimming Championships 2000 and a bronze medal at the 2001 World Aquatics Championships; she finished ninth at the 2000 Summer Olympics. She also competed in freestyle, winning a gold medal in the 4×200-metre relay at the 2002 Commonwealth Games.