学校的校训是, 崔服务Est注册,源自 公祷书, originally referred to a person's service to God. The motto is now accepted more broadly to connote service to the community and the world, and it inspires many Grotonians to make community service part of their lives. Groton had two earlier mottos, before the turn of the twentieth century: Esse quam videri (To be rather than to seem) and the lesser-known Deo Magistro Semper Condiscipuli (Forever fellow-learners, God, our Master, blessing).