Teams David O'Sullivan played for
| Main ListA | North West Warriors (2024-2025) |
| Main Twenty20 | North West Warriors (2024-2025) |
| Other FC | Cardiff Marylebone Cricket Club University (2017) |
| Second Eleven Championship | Glamorgan Second XI (2017) |
| Derbyshire Second XI (2017) | |
| Surrey Second XI (2022) | |
| Hertfordshire Premier League | Welwyn Garden City (2018-2021) |
| Home Counties Premier League | Harefield (2016) |
| Middlesex Premier League | North Middlesex (2022) |
| South Wales New Premier League | Newport (2017) |
| Miscellaneous | Harefield Second XI (2015) |
| Harefield (2015) | |
| Cardiff (2015) | |
| Merchant Taylors' School (2015) | |
| Harefield (2015) | |
| Cardiff Marylebone Cricket Club University (2016/17-2017) | |
| Essex Second XI (2020) | |
| Welwyn Garden City (2021) | |
| Free Foresters Academy (2021-2022) | |
| Surrey (2022) | |
| North Middlesex (2022) | |
| Free Foresters (2022) |
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