John Blackwell may refer to:
John Blackwell (Alun) (1797–1840), Welsh poet John Blackwell (engineer) (c. 1775–1840), English civil engineer John Blackwell (musician) (1973–2017), drummer in the New Power Generation John Blackwell (referee), English football referee and soldier John Blackwell (basketball) (born 2004), American college basketball player Ken Blackwell (John Kenneth Blackwell, born 1948), American politician, author, and conservative activist