Killen (from Irish Cillín, meaning 'little church')[1] is a small village and townland (of 356 acres) in County Tyrone, Northern Ireland.

It is several miles southwest of Castlederg, on the road leading south over Scraghy Mountain.

A short distance to the west lies County Donegal, in the Republic of Ireland.

It is situated in the civil parish of Longfield West and the historic barony of Omagh West.

[3] In recent years, Killen Creamery has been turned into a community centre and business centre.