Imokilly (Irish: Uí Mhic Coille) is one of the baronies of Ireland, an historical geographical unit of land. Its chief town is Youghal. It is one of 24 baronies in the county of Cork. Other neighbouring baronies include Barrymore to the west (whose chief town is Midleton) and Kinnatalloon to the north (whose chief town is Conna).
The barony includes most of the peninsula or land ranging from Mount Uniacke in the valley of the River Bride (in the north), to the estuary of the Munster Blackwater (in the east), to Ballycotton Bay (in the south) to Cork Harbour in the west. The main settlements are Youghal, Killeagh, Castlemartyr, Ballycotton, Shanagarry, Mogeely and Cloyne.
Baronies were created after the Norman invasion of Ireland as divisions of counties and were used in the administration of justice and the raising of revenue. While baronies continue to be officially defined units, they have been administratively obsolete since 1898. However, they continue to be used in land registration and in specification, such as in planning permissions. In many cases, a barony corresponds to an earlier Gaelic túath which had submitted to the Crown.
Both Imokilly and the adjacent barony of Barrymore formed the early medieval kingdom of the Uí Liatháin which was awarded to the Cambro-Norman De Barry family by King John of England in 1206. Its name derives from the Gaelic name of the most powerful septs in the ancient kingdom - the Uí Meic Caille and the Uí Thassaig.