| 1921 Australasian Championships | |
|---|---|
| Date | 26–31 December 1921 |
| Edition | 14th |
| Category | Grand Slam (ITF) |
| Surface | Grass |
| Location | Perth, Western Australia, Australia |
| Venue | Kitchener Park |
| Champions | |
| Singles | |
 Rice Gemmell | |
| Doubles | |
| Stanley Eaton / Rice Gemmell | |
The 1921 Australasian Championships was a tennis tournament that took place on outdoor Grass courts at the Kitchener Park, Perth, Australia from 26 December to 31 December. It was the 14th edition of the Australian Championships (now known as the Australian Open), the 3rd held in Perth, and the third Grand Slam tournament of the year. The single titles was won by Australian Rice Gemmell.