Michael James Holtz (born October 10, 1972) is an American former professional baseball middle relief pitcher who played from 1996 through 2006 for the California / Anaheim Angels (1996–2001), Oakland Athletics (2002), San Diego Padres (2002), and Boston Red Sox (2006). He bats and throws left-handed. In an eight-season career, Holtz posted a 16–19 record with a 4.76 ERA and three saves in 353 relief appearances.