Robert O'Callaghan may refer to: * Robert O'Callaghan (British Army officer) (1777–1840), member of the Parliament of Ireland for Bandonbridge, 1798–1801 * Robert O'Callaghan (politician, born 1710) (1710–1761), Irish politician, member of the Parliament of Ireland for Fethard, Tipperary, 1755–1760 * R. E. O'Callaghan (Robert Elliott O'Callaghan, 1855–1936), English vegetarianism activist, lecturer and writer

See also