Irish: Cill Ria meaning church on the hill) is a village in County Londonderry, Northern Ireland, close to the boundary with County Antrim. In the 2001 Census it had a population of 1,513 people.
According to 'The Fairy Thorn' a book produced by Kilrea local historians, St Patrick visited the area in the 600s. It became a plantation town and grew substantially during that time .It is a preserved example of a Plantation village, with long, straight roads from its centre-point, 'The Diamond'. It was the headquarters of the Worshipful Company of Mercers and sits high up the Bann Valley and enjoys a vantage point above the river. It has a busy market and a modern range of shops which are built around the attractive flower-bedded Diamond. A feature of Kilrea has been its 'Fairy Thorn' tree, on Church Street The 'Fairy Thorn' is the focal point of the summer festival in the town. The River Bann is at its most pleasing here, with picturesque waterfalls at Portna and Movanagher. Sinn Féin and the SDLP both have advice centres in the town. Kilrea Pipe Band dates from 1921. Today it participates in competitions in Northern Ireland, Ireland and Scotland, events including those organised by local charities and community groups, and the cross-community Fairy Thorn Festival in Kilrea.