John Langdon

John Langdon may refer to:


 * John Langdon (bishop) (died 1434), English Bishop of Rochester
 * John Langdon (driver) (born 1947), New Zealand harness race driver
 * John Langdon (historian) (1944–2016), Canadian historian
 * John Langdon (politician) (1741–1819), American politician from New Hampshire
 * John Langdon (typographer) (born 1946), American typographer known for his ambigrams