In basketball, Glenn's boys team won the Long Island and Suffolk County Class A championships in 2014, the Class B Championship in 1987 and 1988 as well as the Long Island Class B Championship in 1988. The girls team won the Suffolk County Class B Championship in 2005, the Suffolk County Class A Championship in 2006 and 2011, the Long Island Class B Championship in 2005, the Long Island Class A Championship in 2006 and the New York State Class B Championship in 2005.