Jack Knight

• Jack Knight (aviator), delivered first overnight transcontinental airmail
• Jack Knight (baseball), American right-handed pitcher in Major League Baseball
• Jack Knight (footballer), Australian rules footballer
• Jack Knight (political scientist), American political scientist
• Jack Knight (songwriter), American songwriter and producer
• Jack Knight (unionist), American labor union leader
• Jack L. Knight, American soldier
• Starman (Jack Knight), comic book character