John de Witt may refer to:
Johan de Witt (1625–1672), Dutch politician who was assassinated John L. DeWitt (1880–1962), U.S. general in World War II who helped initiate the Japanese-American internment John DeWitt (athlete) (1881–1930), American college football player and Olympic hammer thrower John H. DeWitt Jr. (1906–1999), American pioneer in radio broadcasting, radar astronomy and photometry John DeWitt (gridiron football) (born 1970), American arena football lineman John DeWitt, pseudonymous author of some of the Anti-Federalist Papers