John O'Reilly or Jack O'Reilly may refer to:
Politics
edit- John O'Reilly (politician) (born 1951), Canadian politician
- John B. O'Reilly Jr. (1948–2025), mayor of Dearborn, Michigan
- John Francis O'Reilly (1888–1942), Australian politician
- John Joe O'Reilly (politician) (1881–1967), Irish politician
- John Joseph O'Reilly (1888–1933), Australian politician
Sports
edit- John O'Reilly (baseball) (born 1995), American baseball player
- John O'Reilly (cricketer) (born 1930), Australian cricketer
- John Joe O'Reilly (Gaelic footballer) (1919–1952)
- Jack O'Reilly (Gaelic footballer) (1896–1942), Irish Gaelic footballer
- Jack O'Reilly (1914–?), Irish footballer
- Jack O'Reilly (runner) (born 1901), Canadian marathoner, runner-up at the 1930 USA Outdoor Track and Field Championships
Others
edit- John O'Reilly (soldier) (born 1908), Irish soldier
- John O'Riley or John Riley (c. 1817 – 1850), Irish soldier
- John O'Reilly (composer) (born 1940), composer and music theorist
- John Boyle O'Reilly (1844–1890), poet and novelist
- John O'Reilly (engineer) (born 1946), vice-chancellor of Cranfield University
See also
edit- John O'Reily (1846–1915), Australian bishop
- John Reilly (disambiguation)
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