San Pietro alle Scale, also known as San Pietro in Castelvecchio is a Roman Catholic parish church located on via San Pietro, Terzo of Città, in Siena, region of Tuscany, Italy. Initially built in the 12th century, this parish church was completely rebuilt in a Baroque style in the 17th century; the brick facade has a portal with a depiction of Glory of St Peter. The belltower dates to 1699, and the facade to 1706.