John Sadler

John Sadler may refer to:


 * John Sadler, English merchant, co-founder of the Merchant's Hope plantation, Virginia, in 1638
 * John Sadler (town clerk) (1615–1674), 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 (industrialist) (1820–1910), English industrialist and public servant associated with Oldbury, West Midlands
 * John W. Sadler (born 1956), American racehorse trainer
 * John Sadler (historian), British historian
 * John Sadler (cricketer) (born 1981), English cricketer