| 2021 in ONE Championship | |
|---|---|
 | |
| Information | |
| First date | January 22, 2021 |
| Last date | December 18, 2021 |
| Events | |
| Total events | 39 |
| One Championship | 24 |
| Road To Events | 15 |
| Fights | |
| Total fights | 274 |
| Title fights | 27 |
The year 2021 was the 11th year in the history of the ONE Championship, a mixed martial arts, kickboxing and Muay Thai promotion based in Singapore.