The 1990 Australian Men's Hardcourt Championships was a tennis tournament played on outdoor hard courts at the Memorial Drive Park in Adelaide in Australia and was part of the World Series of the 1990 ATP Tour. The tournament ran from 1 through 7 January 1990.
Thomas Muster defeated Jimmy Arias 3–6, 6–2, 7–5
- It was Muster's 1st title of the year and the 7th of his career.
Andrew Castle / Nduka Odizor defeated Alexander Mronz / Michiel Schapers 7–6, 6–2
- It was Castle's only title of the year and the 3rd of his career. It was Odizor's 1st title of the year and the 7th of his career.