The 1937 Melrose High School (Iowa) Shamrocks were the Iowa state high school basketball champions. With an enrollment of only 66, the Melrose Shamrocks were the smallest school ever to win a single-class state basketball title in Iowa. The team finished their season 33–0, the first undefeated boys basketball team in Iowa history. In 2012, the Des Moines Register recognized the Shamrocks as one of the ten best State tournament teams in Iowa history. In May 2012, the Iowa House of Representatives officially congratulated the 1937 Melrose Shamrocks basketball team on the 75th anniversary of their championship.