The 1984 Australian Open was a tennis tournament played on grass courts at the Kooyong Lawn Tennis Club in Melbourne in Victoria in Australia. Held from 26 November through 9 December 1984, it was the 73rd edition of the Australian Open. American Chris Evert became the first tennis player in the open era to win 1,000 matches during this fortnight, ending the tournament with the women's title and a match winning record of 1,003 – 97. Sweden's Mats Willander won the men's single title, successfully defending his 1983 Australian Open championship picking up his third Grand Slam title.

Seniors

Men's singles

🇸🇪 Mats Wilander defeated Kevin Curren 6–7(5–7), 6–4, 7–6(7–3), 6–2

Women's singles

🇺🇸 Chris Evert defeated Helena Suková 6–7(4–7), 6–1, 6–3

Men's doubles

🇦🇺 Mark Edmondson / 🇺🇸 Sherwood Stewart defeated 🇸🇪 Joakim Nyström / 🇸🇪 Mats Wilander 6–2, 6–2, 7–5

Women's doubles

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

Mixed doubles

Juniors

Boys' singles

🇦🇺 Mark Kratzmann defeated 🇦🇺 Patrick Flynn 6–4, 6–1

Girls' singles

🇬🇧 Annabel Croft defeated 🇸🇪 Helena Dahlström 6–0, 6–1

Boys' doubles

🇦🇺 Mike Baroch / 🇦🇺 Mark Kratzmann defeated 🇦🇺 Brett Custer / 🇦🇺 David Macpherson 6–2, 5–7, 7–5

Girls' doubles

🇦🇺 Louise Field / Larisa Savchenko defeated 🇦🇺 Jackie Masters / 🇳🇿 Michelle Parun 7–6, 6–2