| From | United Kingdom 🇬🇧 |
| Date of birth | 27th Dec 1998 |
| Age | 27 years old |
| Gender | Male |
| Height | 176 cm |
| Climbing | |
| Hardest Boulder (Worked) | 9A |
| Hardest Boulder (Flash) | 8B+ |
| Hardest Sport (Worked) | 9b+ |
| Hardest Sport (Onsight) | 8b |
| Hardest Sport (Flash) | 8b+ |
| Hardest Trad (Worked) | E8 |
| World Cups | |
| Appearances | 24 |
| Notable Partnerships | |
| Aidan Roberts | |
Will Bosi is a climber from Edinburgh in Scotland. He first came to prominence as a competition climber, but has since become one of the leading climbers across both sport climbing and bouldering. In 2020 he became only the second Brit to climb 9b with La Capella, and in 2025 he made the second ascent of Excalibur (9b+), becoming the first British climber to climb the grade.
Much of Will's most notable climbing since 2022 has been in bouldering. In 2022 he made the first ascent of Honey Badger (8C+) at Badger Cove, and later that year climbed Alphane (9A). He has since added Burden of Dreams (9A), Return of the Sleepwalker (9A) and Spots of Time (9A). In 2025 Will made the first ascent of Realm of Tor'ment (9A), making him the first person to climb five 9A boulders.
Will continues to push himself on projects such as Silence (9c), Terranova (8C+) and the Dumby Project.
[1] My Climbing Journey April 2023, https://www.youtube.com/watch?v=ZmmMbpCsSuA
[2] Interview with Lattice Training https://www.youtube.com/watch?v=Cn1dJNPfAfc
[3] https://www.climbing.com/people/interview-will-bosi-spots-of-time/
[4] Interview with Emil Abrahamsson Jan 2026 https://www.youtube.com/watch?v=OygaAqejUTg
[5] https://fanatic-climbing.com/will-bosi-sur-une-ile-deserte-will-bosi-on-a-desert-island/