The Church of San Pedro el Real (St Peter the Royal), also known as San Pedro el Viejo is a small medieval church in central Madrid, Spain.

It may have begun as Benedictine monastery, although the Bell-tower has Mudéjar qualities, and resembles a minaret; however, present tower seems to have been worked on in the 14th century when Madrid was firmly in Castilian hands.

It was originally built by King Alfonso XI to celebrate his victory in the Battle of Algeciras in 1344.

The church contains the tombs of Kings Alfonso I of Asturias and Ramiro II of León.

This article about a Roman Catholic church building in Spain is a stub.