Martin Horace Castillo (born January 16, 1957) is an American former Major League Baseball third baseman and catcher. Castillo, who is of Mexican descent, is an alumnus of Savanna High School in Anaheim, California. Drafted by the Detroit Tigers in the fifth round of the 1978 Major League Baseball Draft, Castillo made his Major League Baseball debut with the Detroit Tigers on August 19, 1981. Castillo played in only seven games combined in the 1981 and 1982 seasons, but saw more frequent action in 1983, playing in 67 games.