Mullagh (/ˈmʊlæ/; Irish: An Mullach, meaning 'the hilltop')[2] is a town, civil parish and townland in County Cavan, Ireland.

The town has a heritage centre dedicated to St Kilian, who was born in Mullagh c 640 and was martyred in Würzburg in Franconia in northern Bavaria, Germany, in circa 689.

The Catholic church, a Victorian neo-Gothic structure located 400m from the village on the Virginia Road (R194), is named in memory of its patron, Saint Kilian.

Dr Jonathan Swift, Dean of St. Patrick's Cathedral in Dublin, wrote parts of Gulliver's Travels and The Tale Of The Tub whilst staying near Mullagh (He is said to have taken inspiration for Gulliver and the Brobdingnagians from a tall local farmer nicknamed 'Big Doughty' when he saw the farmer lifting a large calf over a gate.)

Thomas Sheridan at Quilca House, which is close to the historic location of the original Mullagh village near the hamlet of Cross.