John O'Reilly
John O'Reilly or Jack O'Reilly may refer to:
Politics
- John O'Reilly (politician), Canadian politician
- John B. O'Reilly Jr., mayor of Dearborn, Michigan
- John Francis O'Reilly, Australian politician
- John Joe O'Reilly (politician), Irish politician
- John Joseph O'Reilly, Australian politician
Sports
- John O'Reilly (baseball), American baseball player
- John O'Reilly (cricketer), Australian cricketer
- John Joe O'Reilly (Gaelic footballer)