John Cramer may refer to:
- John Cramer (announcer) (born 1955), American television announcer
- John Cramer (representative) (1779–1870), US Representative from New York
- John Cramer (priest) (1793–1848), English classical scholar and geographer
- John G. Cramer (born 1934), professor of physics at the University of Washington in Seattle, SF author
- John Cramer (Australian politician) (1896–1994), member of the Australian House of Representatives, 1949–1974