Sportspeople from Watford

Anthony Oluwafemi Olaseni "AJ" Joshua is a British professional boxer. He held the unified heavyweight championship twice between 2017 and 2021. He also held the International Boxing Organization (IBO) title during his reigns as champion. At regional level, he held the British and Commonwealth heavyweight titles from 2015 to 2016.

Olajide Olayinka Williams "JJ" Olatunji ( born 19 June 1993), known professionally as KSI, is a British influencer, musician, and former professional boxer. He is a co-founding member of YouTube group the Sidemen, the co-founder of Misfits Boxing and co-owner of several businesses, including Prime Hydration and Lunchly. KSI has also served as a judge on ''Britain's Got Talent'' since 2026.

British athlete (1935–2020)

British middle-distance runner

British athlete

Australian boxer

British weightlifter

English darts player