Mullaghmast (), (modern spelling in English is Mullamast) is a hill in the south of County Kildare, Leinster, near the village of Ballitore and near the borders with Wicklow, Laois and Carlow. It was an important site in prehistory, in early history and again in more recent times. It is classed as a National Monument by the Department of the Environment, Community and Local Government.