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.

Ivan Lendl defeated Stefan Edberg 4–6, 7–6^(7–3), 5–2 (Edberg retired)

Steffi Graf defeated Mary Joe Fernández 6–3, 6–4

Pieter Aldrich / Danie Visser defeated Grant Connell / Glenn Michibata 6–4, 4–6, 6–1, 6–4

Jana Novotná / Helena Suková defeated Patty Fendick / Mary Joe Fernández 7–6^(7–5), 7–6^(8–6)

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