John O'Leary
John O'Leary may refer to:
Arts and entertainment
- John O'Leary (journalist), editor of the Times Higher Education Supplement
- John O'Leary (actor),, American actor in My Chauffeur
- John O'Leary (blues harmonica artist), British blues harmonica player, originally with the band Savoy Brown
Government and politics
- John O'Leary (ambassador), U.S. ambassador to Chile
- John O'Leary (Fenian), Irish nationalist who was imprisoned in England
- John O'Leary (Kerry politician), Irish Fianna Fáil party politician and TD for Kerry South
- John O'Leary (Wexford politician), Irish Labour party politician and TD for Wexford
- John F. O'Leary, U.S. head of Federal Energy Administration
Sports
- John O'Leary (Canadian football), Canadian football running back
- John O'Leary (Gaelic footballer), Irish Gaelic footballer
- John O'Leary (golfer), Irish golfer
- John O'Leary (sport shooter), British Olympic sport shooter
- Jack O'Leary, American football and basketball coach, college athletics administrator
- Jack O'Leary (runner), Irish long-distance runner