William George Jacks (born 21 November 1998) is an English cricketer. He is a right-handed batsman and off spin bowler. He made his List A debut on 18 May 2018 for Surrey against Somerset in the 2018 Royal London One-Day Cup. In his third game, in the same competition, he scored a match-winning 121 against Gloucestershire.
In a pre-season T10 match against Lancashire, Jacks scored a century in 25 balls, believed to be the fastest hundred in a match between two professional teams. His century also included six sixes in one over.