The 2017 Royal London One-Day Cup tournament was a limited overs cricket competition that forms part of the 2017 domestic cricket season in England and Wales. Matches were contested over 50 overs per side and had List A cricket status. All eighteen First-class counties competed in the tournament which ran from the end of April with the final taking place at Lord's on 1 July. Nottinghamshire won the tournament, defeating Surrey in the final. The defending champions were Warwickshire.