John O'Reilly

John O'Reilly may refer to:


 * John O'Reilly (baseball) (born 1995), American baseball player
 * John O'Reilly (soldier) (born 1908), Irish soldier
 * John O'Reilly (politician) (born 1951), Canadian politician
 * John O'Reilly (composer) (born 1940), composer and music theorist
 * John O'Reilly (cricketer) (born 1930), Australian cricketer
 * John B. O'Reilly Jr. (born 1948), mayor of Dearborn, Michigan
 * John Boyle O'Reilly (1844–1890), poet and novelist
 * John Francis O'Reilly (1888–1942), Australian politician
 * John Joseph O'Reilly (1888–1933), Australian politician
 * John O'Reilly (engineer) (born 1946), vice-chancellor of Cranfield University
 * John Joe O'Reilly (politician) (1881–1967), Irish politician
 * John Joe O'Reilly (Gaelic footballer) (1919–1952)