Conchobar mac Taidg Mór (died 882) was a King of Connacht from the Uí Briúin branch of the Connachta. He was the grandson of Muirgius mac Tommaltaig (died 815), a previous king. His father Tadg Mór (died 810) had been slain fighting in Muirgius' wars versus the minor tribes of Connacht. He was of the Síl Muiredaig sept of the Uí Briúin. The Ó Conchobhair septs of Connacht are named for him.