2018 One-Day Cup
| Dates | 17 May – 30 June 2018 |
|---|---|
| Administrator(s) | England and Wales Cricket Board |
| Cricket format | Limited overs cricket (50 overs) |
| Tournament format(s) | Group stage and knockout |
| Champions | Hampshire |
| Participants | 18 |
| Matches | 77 |
| Most runs | Heino Kuhn (696) |
| Most wickets | Matt Parkinson (18) |
| Official website | ecb.co.uk |
The 2018 Royal London One-Day Cup tournament was a limited overs cricket competition that formed part of the 2018 domestic cricket season in England and Wales. Matches were contested over 50 overs per side and have List A cricket status. All 18 first-class counties competed in the tournament, which ran from the middle of May until the end of June, when the final took place at Lord's Cricket Ground. Nottinghamshire were the defending champions of the tournament, having beaten Surrey in 2017 final.