John C. White
 For another John C. White see John White (Louisiana politician).John Coyle White (November 26 1924 – January 20 1995) was an elected and appointed Democratic official from Texas. He was the longest-serving Texas Commissioner of Agriculture first elected in 1950 and serving until his resignation in 1977. He was the youngest person ever elected to statewide office in Texas. From 1977 to 1978 he was United States Deputy Secretary of Agriculture.