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Tadg mac Conchobair (died 900) was a King of Connacht from the Uí Briúin branch of the Connachta. He was the son of Conchobar mac Taidg Mór (died 882), a previous king, the second of his three sons to rule in succession, succeeding his brother Áed mac Conchobair (died 888). He was of the Síl Muiredaig sept of the Uí Briúin. He ruled from 888-900.