Athletics
Glenbrook North is a member of the Central Suburban League. The school is also a member of the Illinois High School Association (IHSA), which sponsors most of the major sport and activity state tournaments in Illinois.
The school sponsors interscholastic teams for young men and women in basketball, cross country, golf, gymnastics, soccer, swimming & diving, tennis, track & field, volleyball, and water polo. Men may also compete in baseball, football, and wrestling. Women may compete in badminton, cheerleading, and softball. While not sponsored by the IHSA, the school also fields teams for men and women in lacrosse.
The following teams won their respective IHSA sponsored state championship tournament:
- Baseball: State Champions (1965–66, 73–74)
- Basketball (boys): 2004–05
- Football: 1974–75
- Soccer (boys): 1983–84
- Swimming & Diving (girls): 1977–78
- Tennis (boys): 1980–81, 98–99, 2005–06
- Volleyball (boys): 1992–93
In 2005, the school became the first large-enrollment high school in Illinois to have won a state championship in each of football, basketball and baseball.
Glenbrook North Hockey who are affiliated with the school, but are not a school sponcored by the school. The team did win back to back state titles in 2007 and 2008. In 2011 the team returned to the title game but lost to the New Trier Trevians.
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