John Downer (1843–1915) was an Australian politician.
John Downer may also refer to:
John Downer (equestrian) (1881–1977), American equestrian John Downer (filmmaker) (born 1952), British film director and producer John Downer (sign painter) (born 1951), American designer
See also John Downes (disambiguation) John Langdon Down (1828–1896), British physician