The boys' lacrosse team won state championships in 1990 (defeating Arthur L. Johnson High School in the final game of the state tournament) and 1991 (vs. Montclair High School), along with Group III championships in 2004 (vs. Westfield High School), 2006 (vs. Randolph High School), 2008 (vs. Montgomery High School), 2009 (vs. Shawnee High School), 2012 (vs. Morristown High School), 2013 (vs. Shawnee), 2014 (vs. Moorestown High School) and 2015 (vs. Shawnee). The program's 10 state group titles are tied for fourth-most statewide. The 1991 team finished the season 19-0 and brought their streak to 34 consecutive wins after taking their second straight state title with a 10-8 win against Montclair in the championship game. The 2009 team won the Group III title in 2009 with an 11-6 win against Shawnee in the finals. In 2011, Ridgewood High School won the Gibbs League and won the Bergen County Tournament Championship vs. Don Bosco Preparatory High School. Ridgewood High School has made it to the final four of the Tournament of Champions (which includes all six state group champions) both in 2012 when they lost to Bridgewater-Raritan High School in triple overtime (Ranked top 20 in the country by "InsideLacrosse" magazine in 2012) and in 2013 to Don Bosco Prep High School (Ranked 25th in the country by "InsideLacrosse" magazine in 2013).