Jonny Clayton (born 4 October 1974) is a Welsh professional darts player who plays in Professional Darts Corporation (PDC) events. Clayton won the 2016 Worthingtons Darts Champion of Champions. His performances on the PDC Pro Tour ensured his qualification for the 2017 PDC World Darts Championship for the first time. His nickname is The Ferret.
Clayton joined the PDC Pro Tour in 2015 after winning a Tour Card on the final day of Qualifying School. His first quarter-final came at the sixth Players Championship event and he lost 6–1 to Benito van de Pas. Clayton qualified for the Grand Slam of Darts later that year, but despite winning his opening match against Terry Jenkins, he went on to finish bottom of his group.
Clayton made his PDC World Championship debut in the 2017 event, and came from a set down to beat fellow Welshman Gerwyn Price 3–1 in the first round.
Clayton kicked off his 2020 season by defeating world number one Michael van Gerwen 10-6 in the opening round of the 2020 Masters.