| Diarmait mac Cerbaill | |
|---|---|
| King of Osraige | |
| Reign | 894–905 908–928 |
| Predecessor | Riagan mac Dúnlainge Cellach mac Cerbaill |
| Successor | Cellach mac Cerbaill Cuilen mac Cellaig |
| House | Dál Birn |
| Father | Cerball mac Dúnlainge |
| Mother | daughter of high-king Máel Sechnaill mac Máele Ruanaid |
Diarmait mac Cerbaill was a king of Osraige from 894 to 905, and again from 908 to 928 AD.