Santa Maria College is a Roman Catholic, boarding and day school for girls, situated in Attadale, a southern suburb of Perth, Western Australia. Established by the Sisters of Mercy in 1938, the school currently caters for approximately 1100 students from Years 5 to 12, including 152 boarders. The college is affiliated with the Association of Heads of Independent Schools of Australia (AHISA), the Australian Boarding Schools' Association (ABSA), the Alliance of Girls' Schools Australasia (AGSA), the Australian Catholic Colleges association (ACC) and the Independent Girls Schools Sports Association (IGSSA). Santa Maria's Brother school is Aquinas College located in Salter Point. Santa Maria College was officially opened by the Sisters of Mercy on 6 February 1938, with approximately 60 boarders and only a handful of day pupils. Seven Sisters of Mercy staffed the College at is current site in Attadale. Santa Maria College, as with most Australian schools, utilises a house system. Students are divided into eight houses, for the purpose of morning meetings in house-group homerooms, and intra-school competition.