The 2015 Royal London One-Day Cup tournament was the scheduled limited overs cricket competition for 2015 season of England and Wales first-class counties. It was won by Gloucestershire, who defeated Surrey by the narrow margin of six runs, despite a hat-trick from Jade Dernbach, in what was described as 'a thrilling finish'. The title was Gloucestershire's first trophy since the 2004 Cheltenham & Gloucester Trophy, when they defeated a Worcestershire side that included 2015 Surrey captain Gareth Batty.