Gadhra Mór mac Dundach (died 1027) was King of Síol Anmchadha and Uí Maine.
Gadhra Mór was one of three known sons of Dundach, chief of the region extending from Grian to Caradh.
Tadhg Mór Ua Cellaigh had been the previous chief of Uí Maine but had been killed in the Battle of Clontarf, so in the following year Gadhra Mór took possession of the region extending from Grian to Caradh.
Four years later he was killed on a predatory excursion in Osraige while accompanying Donnchad mac Briain, King of Munster.
This biography of a member of an Irish royal house is a stub.