| Venue: | Glentress Forest, Scotland |
| Date: | 6 August 2023 |
| Events: | 2 |
| Previous: | 2022 Haderslev |
| Next: | 2024 |
The 2023 UCI Mountain Bike Marathon World Championships took place on 6 August 2023 in Glentress Forest, Scotland, as part of the inaugural UCI Cycling World Championships.[1] It was the 21st edition of the UCI Mountain Bike Marathon World Championships.
| Men | Henrique Avancini | 4:14:42 | Martin Stošek | +0:28 | Lukas Baum | +1:43 | |
| Women | Mona Mitterwallner | 5:07:50 | Candice Lill | +0:54 | Adelheid Morath | +9:20 |