Coolsaragh is a townland lying within the civil parish of Kilcronaghan, County Londonderry, Northern Ireland. It lies in the south of the parish on the boundary with the civil parish of Desertmartin, and it is bounded by the townlands of: Annagh & Moneysterlinn, Cloughfin, Gortahurk, Keenaght, Killynumber, Killytoney, Longfield, and Tullyroan. It was apportioned to the Drapers company.