The Mystic River Rugby Club, sometimes called Boston Mystic, is a New England Rugby Football Union (NERFU) club, founded in 1974, located in Malden, Massachusetts and Melrose, Massachusetts, who field teams in Division 1 American Rugby Premiership and Division 2 Rugby Union in the United States and are the current 2018 USA Rugby D1 National Champions. Their home field is located at Pine Banks Park. Their primary sponsor is Coors Light.