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| O'Carroll Ó Cearbhaill | |
|---|---|
 Arms of O'Carroll | |
| Parent house | Ciannachta |
| Country | Kingdom of Éile |
| Founder | Cian mac Ailill Aulom |
| Current head | Fredrick Arthur O'Carroll |
| Final ruler | Tiege Cian O'Carroll |
| Titles | |
| Cadet branches | Carrol of Maryland |
O'Carroll (Irish: Ó Cearbhaill), also known as simply Carroll, Carrol or Carrell, is a Gaelic Irish clan which is the most prominent sept of the Ciannachta (also known as Clan Cian). Their genealogies claim that they are kindred with the Eóganachta (themselves led by the O'Sullivans and MacCarthys), descended paternally from Ailill Aulom. From the Middle Ages until 1552, the family ruled an area within the Kingdom of Munster known as Éile. The last monarch Tiege Cian O'Carroll surrendered and regranted to the Tudor Kingdom of Ireland.