John Basil Fitzgerald OAM (born 28 December 1960, in Cummins, South Australia, Australia) is a former professional tennis player from Australia who played right-handed with a single-handed backhand.
During his career, he won 6 top-level singles titles and 30 tour doubles titles, including 7 Grand Slam doubles titles, and a career men's doubles Grand Slam (winning all four titles-the Australian Open, French Open, Wimbledon and the U.S. Open). He reached the World No. 1 doubles ranking in 1991. His career-high singles ranking was World Number 25 in 1988. He was a member of the Australian team which won the Davis Cup in 1986.