The Co-cathedral of Santa MarÃÂa la Mayor (Spanish: Concatedral de Santa MarÃÂa la Mayor) is a co-cathedral located in Guadalajara, in Castile-La Mancha, Spain. It is one of the seats of the Roman Catholic Diocese of Sigüenza-Guadalajara.
The building was built in the Mudéjar style. It was declared Bien de Interés Cultural on 12 July 1941.