All Hallows' School is a Catholic day school for girls, located in Fortitude Valley, close to the central business district of Brisbane, Queensland, Australia. Founded in 1861, the school follows in the tradition of the Irish Sisters of Mercy, and caters for over 1,400 girls from Years five to 12. The school was the first permanent home of the Sisters of Mercy in Queensland, and is the oldest surviving secondary school in Brisbane. Many of the All Hallows' School Buildings have been listed on the Queensland Heritage Register.