| Co-cathedral of Santa María de la Fuente la Mayor | |
| Native Name: | Concatedral de Santa María de la Fuente la Mayor |
| Native Language: | Spanish |
| Coordinates: | 40.6356°N -3.1614°W |
| Location: | Guadalajara, Spain |
| Designation1: | Spain |
| Designation1 Offname: | Concatedral de Santa María de Guadalajara-Iglesia de Santa María la Mayor o de la Fuente |
| Designation1 Type: | Non-movable |
| Designation1 Criteria: | Monument |
| Designation1 Date: | 1941 |
| Designation1 Number: | RI-51-0001110 |
The Co-cathedral of Santa María de la Fuente la Mayor (Spanish: Concatedral de Santa María de la Fuente la Mayor) is a co-cathedral located in Guadalajara, in Castile-La Mancha, Spain. It is in the Roman Catholic Diocese of Sigüenza-Guadalajara.
The building is in mudejar style.It was declared Bien de Interés Cultural in 1941.