The 1975 Australian Open was a tennis tournament played on outdoor grass courts at the Kooyong Stadium in Melbourne in Australia and was held from 21 December 1974 to 1 January 1975. It was the 63rd edition of the Australian Open and the first Grand Slam tournament of the year. The singles titles were won by Australians John Newcombe and Evonne Goolagong Cawley.

John Newcombe defeated Jimmy Connors, 7–5, 3–6, 6–4, 7–6 ^(9–7)

Evonne Goolagong defeated Martina Navratilova, 6–3, 6–2