The Osona Regional Archive (ACOS) was created on 6 March 1990, through an agreement signed by the Department of Culture of the Catalan Goverment (Generalitat de Catalunya), the Osona Regional Council and the Vic City Council. On 1 April 1995, the ACOS opened its doors in the old convent of El Carme de Vic, where it shared a building with the Museu de l’Art de la Pell and the Joan Triadú Library.

On 13 September 2006, a new agreement was formalised between the Department of Culture of the Generalitat de Catalunya and the Vic City Council for the financing of a new headquarters. The new building was inaugurated on 17 March 2010.

In accordance with the functions determined by Law 10/2001, on archives and document management, the ACOS safeguards the semi-active documentation of the bodies of the Generalitat de Catalunya, the local and judicial administration of the region.

Of the privately owned funds deposited in this archive, those of the Hospital de la Santa Creu and the various company funds stand out for their historical value and exemplary testimony. However, the characteristic feature of the ACOS is its photographic archive aspect, because it houses numerous personal funds and local collections of historical photography.