Chadwick's Upper School Community Service Advisory Board (CSAB) is a group of dedicated students who are fully committed to bettering themselves and the community through service. CSAB plans and executes on- and off-campus service trips, activities, and fundraisers that promote the well-being of those who are unsheltered, learning challenged, in foster care, academically at-risk, or food insecure.

There is also a Middle School CSAB composed of eight students who bring service opportunities to the seventh and eighth grades. The board is run under the leadership of Chadwick's Director of Community Service, Becky Noble, who has been working at Chadwick School as the Director of Community Service for 21 years.