John O'Reilly

• 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

• 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

• 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

• John O'Reily (1846–1915), Australian bishop
• John Reilly (disambiguation)

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