John Richard Greenwell (2 January 1884 – 20 November 1942) was an English football manager and former player. He is Barcelona's longest serving manager, having coached the club for ten consecutive seasons (initially as player-coach, then as manager), later returning to coach for two more seasons in the 1930s. In 1939, Greenwell became the only non-South American coach to date to win the South American Championship when he guided Peru to their first win. He also served as a manager with CD Castellón, RCD Español, Valencia CF, Sporting de Gijón, Real Sociedad Alfonso XIII, Universitario de Deportes, and Independiente Santa Fe.
