Athletics
Chatham High School now competes in the Northwest Jersey Athletic Conference, following a reorganization of sports leagues in Northern New Jersey by the New Jersey State Interscholastic Athletic Association (NJSIAA).
The boys basketball team won the 2007 Group II NJSIAA State Championship, defeating Pascack Hills High School 67-53 in the semifinals and topping Haddonfield Memorial High School 48-42 in the finals.
The boys tennis team won the North II, Group II state sectional championship with a 3-2 win over West Essex High School.
The boys cross country team won the 2006 North II, Group II state sectional championship for the second time in three years and won again in 2008. Additionally, the team went on to win the 2006 Morris County Championship, topping both perennial powerhouses Morris Hills and Delbarton.
The girls soccer team won the 2004 Group II NJSIAA State Championship, defeating Cinnaminson High School in the finals in double overtime by a score of 1-0.
The 2007 girls volleyball team won the triple crown, winning the conference, county and state championships, winning the Group II state championship with a come-from-behind win in three games against Northern Valley Regional High School at Demarest (11-25, 25-19, 25-22). They lost in the semifinals of the Tournament of Champions to Hunterdon Central Regional High School by 26-24 and 29-27.
The 2008 boys tennis team won the North II, Group II state sectional championship with a 4-1 win in the tournament final over Mountain Lakes High School.
The 2008 girls lacrosse team won the triple crown by capturing the conference, county, and state championships while being ranked the no. 3 team in the state. They lost 16-9 to powerhouse Moorestown High School in Chatham High School's first ever appearance in the Tournament of Champions final game.
The 2008 Chatham golf team completed a highly successful campaign by going undefeated at 21-0 for the year. The Cougars won the conference championship as well as the NJ Group II State Championship. Chatham was named Golf Team of the Year by the Daily Record and was ranked fifth in the state of by The Star-Ledger by virtue of their overall finish at the Tournament of Champions event held at Beacon Hill Country Club in Atlantic Highlands.
The 2010 men's soccer team advanced to the Group 4 State Championship, where they fell to Holmdel 2-1.
The 2010-2011 Chatham hockey team won the Public B state championship with a 7-3 victory over Middletown High School South at the Prudential Center, the school's first state championship in the sport since the tournament system began in 1976.
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