William Hagarty O'Leary (1836 - 15 February 1880) was an Irish doctor and politician.
O'Leary was born in Dublin as William Hagarty Leary; he later adopted the O'Leary form of the name. He and his wife had nine children. He became a fellow of the Royal College of Surgeons in 1871. He was elected Member of Parliament for Drogheda in 1874 and sat for the seat as a Home Ruler until his death in 1880. A contemporary remarked of him that "Mr. O'Leary spoke very eloquently, though somewhat floridly. In stature he was very short." He was buried in Glasnevin Cemetery.
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