The Dallas Rattlers were a professional men's field lacrosse team as a member of Major League Lacrosse (MLL) based in Frisco, Texas starting in 2018. The franchise was a charter member of the MLL, operating as the Rochester Rattlers in Rochester, New York, from 2001 to 2008 and 2011 to 2017.

Major League Lacrosse (MLL) was a men's field lacrosse league in the United States. The league's inaugural season was in 2001. Teams played anywhere from ten to 16 games in a summertime regular season. This was followed by a four-team playoff for the championship trophy, the Steinfeld Trophy, named after founder Jake Steinfeld. League attendance peaked at 6,417 in 2011 and the 2019 average was 4,587.