The 1985 Australian Open was a tennis tournament played on grass courts at the Kooyong Lawn Tennis Club in Melbourne in Victoria in Australia. It was the 74th edition of the Australian Open and was held from 25 November through 8 December 1985; the last to be held at this time of year. With the decision to hold the tournament in January in future, the next Australian Open would be the 1987 Open, held just over a year later.

Seniors

Men's singles

🇸🇪 Stefan Edberg defeated 🇸🇪 Mats Wilander, 6–4, 6–3, 6–3

Women's singles

🇺🇸 Martina Navratilova defeated 🇺🇸 Chris Evert, 6–2, 4–6, 6–2

Men's doubles

🇺🇸 Paul Annacone / Christo van Rensburg defeated 🇦🇺 Mark Edmondson / 🇦🇺 Kim Warwick, 3–6, 7–6, 6–4, 6–4

Women's doubles

🇺🇸 Martina Navratilova / 🇺🇸 Pam Shriver defeated Claudia Kohde-Kilsch / Helena Suková 6–3, 6–4

Mixed doubles

Juniors

Boys' singles

🇦🇺 Shane Barr defeated 🇦🇺 Steve Furlong 7–6, 6–7, 6–3

Girls' singles

🇦🇺 Jenny Byrne defeated 🇦🇺 Louise Field 6–1, 6–3

Boys' doubles

🇦🇺 Brett Custer / 🇦🇺 David Macpherson defeated Petr Korda / Cyril Suk 7–5, 6–2

Girls' doubles

🇦🇺 Jenny Byrne / 🇦🇺 Janine Thompson defeated 🇦🇺 Sally McCann / 🇦🇺 Alison Scott 6–0, 6–3