John Clay may refer to:John Clay, English soldier John Clay (1851–1934), Scottish-born American cattleman and financier, founder of the John Clay Livestock Commission John Clay (chaplain) (1796–1858), English prison chaplain John Clay (1924–2011), English cricketer John Clay, American football player John Clay, American football player John Cecil Clay (1875–1930), American illustrator John Granby Clay (1766–1846), British general John Morrison Clay (1821–1887), American horse breeder John P. Clay (1934–2013), investment banker and founder of the Clay Sanskrit Library John Randolph Clay (1808–1885), American diplomat Johnnie Clay (1898–1973), English cricketer The Red-Headed League, an 1891 short story by Arthur Conan Doyle with a character named John Clay John Clay Livestock Commission, defunct American company