John Cornwell
John Cornwell may refer to:
- Jack Cornwell (1900–1916), British sailor posthumously awarded the Victoria Cross for gallantry at the Battle of Jutland
- John J. Cornwell (1867–1953), American politician, Governor of West Virginia
- John Cornwell (writer) (born 1940), British journalist, author, and academic
- John Cornwell (footballer) (born 1964), English footballer
- John Cornwell (artist) (1930–2020), Australian artist