Murchadh mac Maenach (died 896) was King of Maigh Seóla.
He is noteworthy as the person who gave his name to the Muintir Murchada, a dynasty whose leading family later took the surname Ó Flaithbheartaigh (O'Flaherty).
A Cleirchin mac Murchadh of Uí Briúin Seóla is listed in the Annals of the Four Masters under 908, though he does not appear in any other source.
According to the genealogies, Murchard's great-great-great-great-grandson was Flaithbheartach mac Eimhin, whose grandson, Muredach Mór Ua Flaithbheartaigh, apparently became the first to bear the surname.
From Ruaidri are the senior lines of the clan (those of Conmaicne Mara (later known as Connemara), Moycullen and Sliocht Diarmaid).