Pierce[1] Charles de Lacy O'Mahony (9 June 1850 – 31 October 1930), known up to 1901 as Pierce Mahony, and from 1912 also as The O'Mahony of Kerry,[2] was an Irish nationalist politician and philanthropist, who practised as a barrister from 1898 to 1900. He was remarkable in having had successively three names, two wives and three faiths, and for being honoured by the Kings of two opposing countries in World War I.
He should not be confused with his grandfather Pierce Mahony (1792–1853), a close associate of Daniel O'Connell who was elected as MP for Kinsale in 1837 but unseated on petition; or with his son Pierce Gun Mahony (1878–1914).