The Alliance of Girls' Schools Australasia (abbreviated as AGSA) is a non-profit organisation that promotes the education of girls in single-sex girls' schools, and promotes the image of, and support the development of, girls' schools in Australasia. The Alliance's first annual general meeting was held in May 1996, where membership of the Alliance was extended to all girls' schools in Australia and New Zealand whether independent, government or Catholic. The Alliance was incorporated 18 August 1997.