William Bosi

William "Will" Bosi
Bosi in the semi-final of the 2018 IFSC Climbing World Championships
Personal information
Born (1998-12-27) 27 December 1998
Edinburgh, Scotland, United Kingdom
EducationBroughton High School, Edinburgh
OccupationProfessional rock climber
Height176 cm (5 ft 9 in)
Weight65.7 kg (145 lb)
Websitewww.bandofbirds.co.uk/willbosi-athlete-page
Climbing career
Type of climber
Ape index+5cm (1.8 in)
Highest grade
Known for
  • First Briton to climb 9b+ (5.15c)
  • Second Briton to climb V17 (9A)
First ascents
  • Honey Badger (V16, 2022)
  • Free at Last (9a+, 2022)
  • King Capella (9b, 2021)
  • Brandenburg (9a+, 2021)
  • La Furia de Jabalí (9a+, 2021)
Updated on 28 June 2023

William (Will) Bosi (born 27 December 1998) is a Scottish professional rock climber specializing in sport climbing, bouldering and competition climbing. Bosi is only the second British sport climber in history to redpoint a 9b (5.15b) graded sport climbing route (King Capella in 2021), and by 2023, was one of only a small group of climbers in the world to have completed a V17 (9A) boulder (Alphane in 2022, Burden of Dreams in 2023, and both Return of the Sleepwalker and Spots of Time in 2024). In 2025, he made a redpoint ascent of the sport climb Excalibur, which is graded 9b+, making him the first British climber to climb at this grade.

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