Flainn
Flainn may refer to:
- Aenghus Ua Flainn
- Ailill Corrach mac Flainn, king of the Uí Failge, a Laigin people of County Offaly
- Cináed mac Flainn, king of the Uí Failge, a Laigin people of County Offaly
- Conaing mac Flainn, King of Brega from the Uí Chonaing sept of Cnogba of the Síl nÁedo Sláine branch of the southern Ui Neill
- Cummascach mac Flainn, king of the Uí Failge, a Laigin people of County Offaly
- Donnchad Donn mac Flainn
- Fithceallach mac Flainn
- Flaithnia mac Flainn, king of the Uí Failge, a Laigin people of County Offaly
- Flann Mac Flainn
- Mugrón mac Flainn, king of the Uí Failge, a Laigin people of County Offaly
- Nicol Mac Flainn
- Ragnall_Ua_Flainn_Chua
- Tóim Snáma mac Flainn, King of Osraige in modern County Kilkenny
- Ólchobar mac Flainn, supposed King of Munster from the Uí Fidgenti of County Limerick
