2023 One-Day Cup
| Dates | 1 August – 16 September 2023 |
|---|---|
| Administrator(s) | England and Wales Cricket Board |
| Cricket format | Limited overs cricket (50 overs) |
| Tournament format(s) | Group stage and knockout |
| Champions | Leicestershire |
| Participants | 18 |
| Matches | 77 |
| Most runs | Ed Barnard (Warwickshire) (616) |
| Most wickets | Oliver Hannon-Dalby (Warwickshire) (24) |
| Official website | ecb.co.uk |
The 2023 One-Day Cup (also known as for sponsorship reasons as 2023 Metro Bank One Day Cup) was a limited overs cricket competition that formed part of the 2023 domestic cricket season in England and Wales. Matches were contested over 50 overs per side, having List A cricket status, with all eighteen first-class counties competing in the tournament. The tournament started on 1 August 2023, with the final taking place on 16 September 2023 at Trent Bridge in Nottingham. Kent were the defending champions, having won the 2022 tournament.
Leicestershire beat Hampshire by two runs in the final, winning their first List A trophy since 1985.