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.

Seniors

Men's singles

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

Women's singles

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

Men's doubles

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

Women's doubles

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

Mixed doubles

Natasha Zvereva / 🇺🇸 Jim Pugh defeated 🇺🇸 Zina Garrison / 🇺🇸 Rick Leach 4–6, 6–2, 6–3

Juniors

Boys' singles

Dirk Dier defeated 🇮🇳 Leander Paes 6–4, 7–6

Girls' singles

🇧🇬 Magdalena Maleeva defeated 🇦🇺 Louise Stacey 7–5, 6–7, 6–1

Boys' doubles

🇸🇪 Roger Pettersson / 🇸🇪 Mårten Renström defeated 🇨🇦 Robert Janecek / 🇲🇽 Ernesto Munoz de Cote 4–6, 7–6, 6–1

Girls' doubles

🇮🇱 Rona Mayer / 🇮🇱 Limor Zaltz defeated 🇦🇺 Justine Hodder / 🇦🇺 Nicole Pratt 6–4, 6–4

Prize money