John O'Sullivan

• John C. O'Sullivan
• John Francis O'Sullivan
• John L. O'Sullivan
• John Lack O'Sullivan
• John M. O'Sullivan
• John O'Sullivan (Cork politician)
• John O'Sullivan (Illinois politician)
• John O'Sullivan (columnist)
• John O'Sullivan (cricketer)
• John O'Sullivan (cyclist)
• John O'Sullivan (engineer)
• John O'Sullivan (footballer)
• John O'Sullivan (rugby league)
• John O'Sullivan (rugby union)
• John O'Sullivan (soldier)
• John Sullivan (disambiguation)