John Halliday

• John Halliday (actor), American actor
• John Halliday (ophthalmologist), Australian doctor
• John Halliday (footballer), English professional footballer
• John Halliday (died 1805), British politician who sat in the House of Commons from 1775 to 1784
• John Halliday (died 1754), British politician who sat in the House of Commons in 1754
• John Halliday (cricketer), English cricketer