Peter O'Leary may refer to: Peter O'Leary (referee) (born 1972), New Zealand association football referee Peter O'Leary (Kerry Gaelic footballer), Gaelic football goalkeeper from County Kerry Peter O'Leary (Laois Gaelic footballer) (born 1985), Gaelic football player from Laois in Ireland Peter O'Leary (sailor) (born 1983), Irish sailor Peadar Ua Laoghaire (1839–1920), Irish-language author