John Sadler

• John Sadler, English merchant, co-founder of the Merchant's Hope plantation, Virginia, in 1638
• John Sadler , English MP, lawyer, Town Clerk of London and Master of Magdalene College, Cambridge
• John Sadler, English printer, inventor of transfer-printing in 1756
• John Sadler , English industrialist and public servant associated with Oldbury, West Midlands
• John W. Sadler, American racehorse trainer
• John Sadler, British historian
• John Sadler , English cricketer