Church of San Pedro, Polvoranca, Ruined church in Polvoranca, Spain.

The Church of San Pedro is a partially ruined religious building with exposed stone walls arranged in a Latin cross plan. The interior originally contained a single nave with side chapels and a barrel vault, features still visible in the remaining structure.

Juan Chacón Ponce de León and Ana de Ossorio bought the territory from the Count of Orgaz in 1575, creating the mayorazgo of Polvoranca, later annexed to Leganés in 1849. With funds gathered partly from church members, Chacón began construction, completed in 1655 by architects Francisco de Mora and his nephew Juan Gómez de Mora. The images were destroyed by the Republican side during the Civil War.

The church was originally dedicated to Saints Cosmas and Damian, but after the village of Polvoranca was abandoned its images were moved to the parish church of Leganés. They were destroyed by the Republican side during the Spanish Civil War; only very fine reproductions remain. The building is now used by groups holding esoteric gatherings, and pentacles, tarot cards and black candles have appeared on its walls.

The ruins are located within Polvoranca Park in the municipality of Leganes and can be viewed from various points within the park. Access is straightforward on foot through local walking paths, and the site is open whenever the park is accessible.

The 2000 find of a cremation furnace with remains of high-imperial and Hispano-Visigothic citizens over 1,500 years old came during surveys for the Arroyo Culebro neighbourhood, not at the church. At the church itself, 1950s and 2005 digs revealed burials, including an embalmed young woman and men with gold spurs.