| Venue: | Elba, Italy |
| Date: | 2 October 2021 |
| Nations: | 30 |
| Cyclists: | 164 |
| Events: | 2 |
| Previous: | 2020 Sakarya |
| Next: | 2022 Haderslev |
The 2021 UCI Mountain Bike Marathon World Championships took place in Elba, Italy on 2 October 2021.[1] It was the 19th edition of the UCI Mountain Bike Marathon World Championships.
| Men | 6:02.03 | 6:04.27 | 6:07.34 | ||||
| Women | 4:48.54 | 4:50.07 | 4:56.31 |