Jack Alexander Haynes (born 30 January 2001) is an English cricketer. He made his List A debut for Worcestershire against the West Indies A in a tri-series warm-up match on 19 June 2018. He made his first-class debut for Worcestershire against Australia on 7 August 2019. In October 2019, he was named in the England under-19 cricket team's squad for a 50-over tri-series in the Caribbean. In December 2019, he was named in England's squad for the 2020 Under-19 Cricket World Cup.