Killala is a village in County Mayo in Ireland, north of Ballina. The railway line from Dublin to Ballina once extended to Killala. To the west of Killala is the townland of Townsplots West, which contains a number of ancient forts. Historically associated with Saint Patrick, and the seat of an episcopal see for several centuries, evidence of Killala's ecclesiastical past include a 12th-century round tower and the 17th century Cathedral Church of St Patrick. As of the 2016 census of Ireland, the village had a population of 562. The village is in a civil parish of the same name.

County Mayo is a county in Ireland. In the West of Ireland, in the province of Connacht, it is named after the village of Mayo, now generally known as Mayo Abbey. Mayo County Council is the local authority. The population was 137,231 at the 2022 census. The boundaries of the county, which was formed in 1585, reflect the Mac William Íochtar lordship at that time.