The Green Line Rivalry, also known as the B-Line Rivalry,[1][2] the Battle of Boston[3] and Battle of Commonwealth Avenue,[4] is the name for the sports rivalry between Boston College and Boston University.[5][6][7] The rivalry is named after the Green Line, a light rail line that runs along Commonwealth Avenue and links the two schools as part of the MBTA, Boston's public transit system. The two campuses lie less than five miles apart.
The Green Line Rivalry is considered one of the top rivalries in college sports[8][9] and first among college hockey rivalries.[10][11] The Green Line Rivalry is the third most played college hockey rivalry series after the Michigan–Michigan State rivalry and the Battle for the Gold Pan.