The school has two chaplains, and all boys, attend morning chapel once a week, with the boarders attending on Sunday.
Religious education is part of the core curriculum.
In the senior school there are two Boarding Houses, two Year 7 houses, and six Day Houses, each of which has a Housemaster and tutors responsible for the welfare and pastoral care of members of the House. The school's counsellor extends the pastoral care provided by Housemasters, tutors and chaplains. Christian values underpin the tone and style of the school. Canberra Grammar School celebrated the International Day of Peace in 1997 with a service and the dedication of a Peace Window , a large stained glass window, which has just been installaed into the school's chapel. The design of the window is abstract in essence with seven rays and seven layers of undulations.