| 2018 in ONE Championship | |
|---|---|
 | |
| Information | |
| First date | January 20, 2018 |
| Last date | December 7, 2018 |
| Events | |
| Total events | 24 |
| Fights | |
| Total fights | 271 |
| Title fights | 22 |
The year 2018 was the 8th year in the history of the ONE Championship, a mixed martial arts, kickboxing and Muay Thai promotion based in Singapore.