Canberra Grammar School is a co-educational, independent, day and boarding school, located in Red Hill, a suburb of Canberra, the capital of Australia.

The school is affiliated with the Anglican Church of Australia and provides an education from pre-school to Year 12 for boys and girls. In October 2015, the school announced that it would extend co-education to all years, commencing in 2016 with an intake of girls in Years 3 and 4. By 2018 the school became fully co-educational.

The school was founded in 1929 when the existing Monaro Grammar School was relocated to Canberra from Cooma. The foundation stone was laid on 4 December 1928 by Prime Minister Stanley Bruce. Initially it was attended by only 63 students, but has grown considerably since the early 1950s to a total attendance of 1,749 students as of June 2015.

The school has educated one Australian Prime Minister and has a long list of notable alumni.

This school consists of 5 main campuses: Red hill Southside, Red hill Primary, Red hill Senior, Early Learning center-(ELC), and Northside Campell ACT- only years Pre school to year 2.