John Merrill may refer to: John Merrill (marathon walker), British sportsman John Merrill (Medal of Honor) (1843–1883), awarded the U.S. Medal of Honor, 1879 John Merrill (American politician) (born 1963), American politician from Alabama John O. Merrill (1896–1975), American architect and structural engineer John P. Merrill (1917–1984), American physician, researcher and Harvard professor John C. Merrill, American professor John Merrill (MP) (died 1734), British government official and politician