The Cornell–Princeton lacrosse rivalry is a college lacrosse rivalry between Princeton University and Cornell University and their respective men's lacrosse teams, Princeton Tigers and Cornell Big Red. The rivalry stems from the dominance of the two programs in the Ivy League where in the first 66 seasons Cornell has won 32 Ivy League Championships and Princeton has won 27 league titles. The next nearest team is Brown with 11 titles The Ivy League awards the league championship to the team with the best record at the conclusion of the regular season. In the event two or more teams are tied with identical records the title is shared with no tie breaking mechanism. The teams shared the title in 2002, 2004, 2006, 2009, 2010 and 2015.

The Princeton Tigers men's lacrosse team represents Princeton University in NCAA Division I men's lacrosse play. Princeton currently competes as a member of the Ivy League and plays its home games at the Class of 1952 Stadium in Princeton, New Jersey.