The New Trier Booster Club's mission is to enhance the New Trier High School experience by fostering Spirit , Sport and Tradition within the New Trier community.
- Spirit : The NT Booster Club promotes school spirit by: providing new school t-shirts to all incoming freshmen; spirit wear sales at school events; concession stand sales at athletic events; publication of seasonal sports guides for all school athletics teams;
- Sport : New Trier students benefit from numerous athletic team and intramural sports opportunities. The NT Booster Club runs intramural sports programs (Basketball, Volleyball, Tennis, Golf, Paddle Tennis) that over 1,000 students participate in each year. The NT Booster Club works very closely with the NT Athletics department to fund coaches requests and select facilities upgrades, benefitting the over 2,000 students who participate in sports teams at New Trier.
- Tradition: As one of the oldest and most successful high schools in the state, New Trier is steeped in tradition. Over the decades, the NT Booster Club has made numerous investments to ensure that New Trier's proud tradition continues. Significant projects funded by the club over the recent years have included the new turf for the Northfield athletic complex, equipment for weight rooms and training facilities and many of the scoreboards at the athletic facilities.