| Tower of Álvar Fáñez | |
| Native Name: | Torreón de Álvar Fáñez |
| Native Language: | Spanish |
| Coordinates: | 40.6364°N -3.1688°W |
| Location: | Guadalajara, Spain |
| Designation1: | Spain |
| Designation1 Offname: | Torreón de Álvar Fáñez |
| Designation1 Type: | Non-movable |
| Designation1 Criteria: | Monument |
| Designation1 Date: | 1921 |
| Designation1 Number: | RI-51-0000193 |
The Tower of Álvar Fáñez (Spanish: Torreón de Álvar Fáñez) is a tower located in Guadalajara, Spain, which served as part of the city's medieval defences. It is named after Álvar Fáñez, known as the 'Conqueror of Guadalajara for Christianity', a Leonese nobleman and military leader who played a significant role in the Christian reconquest of Spain during the 11th century.
The tower was declared Bien de Interés Cultural in 1921.