1990 Australian Men's Hardcourt Championships
| 1990 Australian Men's Hardcourt Championships | |
|---|---|
| Date | 1–7 January |
| Edition | 46th |
| Category | World Series |
| Draw | 32S / 16D |
| Prize money | $125,000 |
| Surface | Hard / outdoor |
| Location | Adelaide, Australia |
| Venue | Memorial Drive Park |
| Champions | |
| Singles | |
 Thomas Muster | |
| Doubles | |
 Andrew Castle /  Nduka Odizor | |
The 1990 Australian Men's Hardcourt Championships was a tennis tournament played on outdoor hard courts at the Memorial Drive Park in Adelaide, Australia and was part of the World Series of the 1990 ATP Tour. It was the 46th edition of the tournament and was held from 1 January through 7 January 1990. Third-seeded Thomas Muster won the singles title.
Finals
Singles
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.
Doubles
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.