Ailech (modern Irish Aileach or Oileach) was a medieval kingdom in Ireland, roughly centred on modern-day County Tyrone and the Inishowen peninsula in Ulster.
The Kings of Ailech belonged to the northern Uí Néill and took their name from the Grianán of Ailech (Irish: Grianán Ailigh), a hillfort on top of Greenan Mountain in modern County Donegal. The restored fort stands in a commanding position at the base of the Inishowen peninsula overlooking Lough Swilly to the west and Lough Foyle to the east.
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