The Cannons are one of the founding franchises of Major League Lacrosse (MLL), beginning play in June of 200. The Boston Cannons won their first MLL Championship on August 28, 2011, hoisting their second MLL Championship in 2020. In December 2020, the Cannons joined the Premier Lacrosse League (PLL) as a part of a merger between MLL and the PLL. The Cannons relaunched as Cannons Lacrosse Club in January 2021.