The 1990 Australian Open was a tennis tournament played on outdoor hard courts at Flinders Park in Melbourne in Victoria in Australia. It was the 78th edition of the Australian Open and was held from 15 through 28 January 1990.
See main article: 1990 Australian Open – Men's singles. Ivan Lendl defeated 
Stefan Edberg 4–6, 7–6(7–3), 5–2 (Edberg retired)
See main article: 1990 Australian Open – Women's singles. Steffi Graf defeated 
Mary Joe Fernández 6–3, 6–4
See main article: 1990 Australian Open – Men's doubles. Pieter Aldrich / Danie Visser defeated 
Grant Connell / Glenn Michibata 6–4, 4–6, 6–1, 6–4
See main article: 1990 Australian Open – Women's doubles. Jana Novotná / Helena Suková defeated Patty Fendick / Mary Joe Fernández 7–6(7–5), 7–6(8–6)
See main article: 1990 Australian Open – Mixed doubles. Natasha Zvereva / Jim Pugh defeated Zina Garrison / Rick Leach 4–6, 6–2, 6–3
Dirk Dier defeated 
Leander Paes 6–4, 7–6
Magdalena Maleeva defeated 
Louise Stacey 7–5, 6–7, 6–1
Roger Pettersson / Mårten Renström defeated Robert Janecek / 
Ernesto Munoz de Cote 4–6, 7–6, 6–1
Rona Mayer / Limor Zaltz defeated Justine Hodder / Nicole Pratt 6–4, 6–4
| width=200 colspan=2 bgcolor=#dfe2e9 | Event | width=80 bgcolor=lime | W | width=85 bgcolor=#D8BFD8 | F | width=85 bgcolor=#FFFF00 | SF | width=85 bgcolor=#ffebcd | QF | width=85 bgcolor=#afeeee | 4R | width=85 bgcolor=#afeeee | 3R | width=85 bgcolor=#afeeee | 2R | width=85 bgcolor=#afeeee | 1R |
| Singles[1] | Men | A$320,000 | A$160,000 | A$80,000 | A$40,000 | A$21,000 | A$12,000 | A$7,500 | A$4,600 | ||||||||
| Women | A$320,000 | A$160,000 | A$80,000 | A$40,000 | A$21,000 | A$12,000 | A$7,500 | A$4,600 | |||||||||