John Leahy is the name of:
Australia John Leahy (footballer) (1941–1980), Australian rules footballer John Leahy (Australian politician) (1854–1909), Australian Conservative politician, 1893–1909 Ireland John Leahy (hurler) (born 1969), former Irish hurler John Patrick Kenneth Leahy (1907–1963), Irish Roman Catholic priest Johnny Leahy (1890–1949), Irish hurler John Leahy (Irish politician), Leader of Renua Ireland United Kingdom John Leahy (diplomat) (1928–2015), former senior British diplomat United States of America John Leahy (executive) (born 1950), American executive at Airbus John E. Leahy (1842–1915), American politician John Martin Leahy (1886–1967), American short story writer, novelist and artist