| 01 Aug 2023 | Metro Bank One Day Cup 2023 | Hampshire v Middlesex | The Ageas Bowl, Southampton | Lost by 18 runs |
| 05 Aug 2023 | Metro Bank One Day Cup 2023 | Middlesex v Surrey | Brunton Memorial Ground, Radlett | Abandoned |
| 11 Aug 2023 | Metro Bank One Day Cup 2023 | Essex v Middlesex | The Cloud County Ground, Chelmsford | Lost by 3 runs |
| 13 Aug 2023 | Metro Bank One Day Cup 2023 | Kent v Middlesex | The Kent County Cricket Ground, Beckenham | Lost by 133 runs |
| 15 Aug 2023 | Metro Bank One Day Cup 2023 | Middlesex v Nottinghamshire | Brunton Memorial Ground, Radlett | Won by 134 runs |
| 18 Aug 2023 | Metro Bank One Day Cup 2023 | Leicestershire v Middlesex | Uptonsteel County Ground, Leicester | Lost by 23 runs |
| 20 Aug 2023 | Metro Bank One Day Cup 2023 | Middlesex v Lancashire | Lord's Cricket Ground, St John's Wood | Lost by 10 runs |
| 22 Aug 2023 | Metro Bank One Day Cup 2023 | Middlesex v Yorkshire | Brunton Memorial Ground, Radlett | Won by 5 wkts |
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