Lagmann mac Gofraid, known in Old Norse as Lǫgmaðr Guðrøðarson and Lögmaðr Guðrøðarson, was a late eleventh-century King of the Isles, whose rise, reign, and fall from power are obscure. He was the eldest son of Gofraid Crobán, King of Dublin and the Isles, a Norse-Gaelic dynast who conquered and ruled the kingdoms of the Isles and Dublin, before dying in 1095.