Leon DeMontreville (September 23, 1874 – March 22, 1962) was a professional baseball player. Primarily a shortstop, DeMontreville spent one season in the major leagues, with the St. Louis Cardinals in 1903. He appeared in 26 games and batted 82 times, posting a .243 batting average and collecting three stolen bases.
DeMontreville's older brother Gene DeMontreville was also a Major League Baseball player.