| 1931 Australian Championships | |
|---|---|
| Date | 27 February – 8 March 1931 |
| Edition | 24th |
| Category | Grand Slam (ITF) |
| Surface | Grass |
| Location | Sydney, New South Wales, Australia |
| Venue | White City Tennis Club |
| Champions | |
| Men's singles | |
 Jack Crawford | |
| Women's singles | |
| Coral McInnes Buttsworth | |
| Men's doubles | |
| Charles Donohoe / Ray Dunlop | |
| Women's doubles | |
| Daphne Akhurst Cozens / Louise Bickerton | |
| Mixed doubles | |
| Marjorie Cox Crawford / Jack Crawford | |
| Boys' singles | |
| Bruce Moore | |
| Girls' singles | |
| Joan Hartigan | |
| Boys' doubles | |
| Jack Purcell / Bert Tonkin | |
| Girls' doubles | |
| Sadie Moon / Emily Hood Westacott | |
The 1931 Australian Championships was a tennis tournament that took place on outdoor Grass courts at the White City Tennis Club, Sydney, Australia from 27 February to 9 March. It was the 24th edition of the Australian Championships (now known as the Australian Open), the 6th held in Sydney, and the first Grand Slam tournament of the year. The singles titles were won by Australians Jack Crawford and Coral McInnes Buttsworth.