The Archives Association of Ontario (AAO) is a network of archives and archivists providing programs, education, advocacy and shared knowledge. Consisting of approximately 300 members, the AAO supports and promotes the work of archivists in preserving the history and culture of Ontario and its citizens. It was established in 1993 as a result of the amalgamation of the Ontario Association of Archivists and the Ontario Council of Archives.
The AAO promotes the development of a co-operative system of archives in Ontario by:
The AAO is governed by a volunteer-based Board of Directors and represents archival institutions, those working in archives, and volunteers, patrons, and supporters of archives. It promotes archives as vital to the fair, transparent, and equitable operations of the Canadian and Ontario governments, and society as a whole. The AAO's Constitution outlines the bylaws guiding the administration and operations of the AAO.