John C. Smith may refer to:
John C. Smith (politician) (1832–1910), American politician John Campbell Smith (1828–1914), Scottish writer John Carraway Smith (ca. 1819–1868), American military officer John Chaloner Smith (1827–1895), Irish engineer John Christopher Smith (1712–1795), English composer John Cotton Smith (1765–1845), American lawyer John Cyril Smith (1922–2003), British legal scholar John C. Smith (war correspondent), see New York Herald Tribune