| 1991 Australian Open | |
|---|---|
| Date | 14–27 January 1991 |
| Edition | 79th |
| Category | Grand Slam (ITF) |
| Surface | Hardcourt (Rebound Ace) |
| Location | Melbourne, Australia |
| Venue | National Tennis Centre at Flinders Park |
| Champions | |
| Men's singles | |
 Boris Becker | |
| Women's singles | |
 Monica Seles | |
| Men's doubles | |
 Scott Davis / David Pate | |
| Women's doubles | |
| Patty Fendick / Mary Joe Fernández | |
| Mixed doubles | |
 Jo Durie / Jeremy Bates | |
| Boys' singles | |
 Thomas Enqvist | |
| Girls' singles | |
 Nicole Pratt | |
| Boys' doubles | |
| Grant Doyle / Joshua Eagle | |
| Girls' doubles | |
 Karina Habšudová / Barbara Rittner | |
The 1991 Australian Open was a tennis tournament played on outdoor hard courts at Flinders Park in Melbourne in Victoria in Australia. It was the 79th edition of the Australian Open and was held from 14 through 27 January 1991.