Hermitage of Santa Cecilia, Romanesque church in Aguilar de Campoo, Spain

The Hermitage of Santa Cecilia is a three-nave stone church built in the Romanesque style characteristic of northern Spain. It displays semicircular arches, thick walls, and decorative carved elements throughout its interior and exterior structure.

The present appearance of Santa Cecilia results from a complete reconstruction carried out during the 12th and 13th centuries. The only trace of an earlier, possibly 11th-century, building is an inscription on a slab cited in a monumental catalogue. Between the 16th and 18th centuries, reforms replaced the original apse. The ruined building was restored in the 1960s and was declared a monument on 9 October 1963.

The church has no regular liturgical use; it stands on the slope below Aguilar de Campoo castle at 920 m. Its name comes from Saint Cecilia, and the building is protected as a monument since 9 October 1963. Visitors today see a restored Romanesque temple rather than an active parish church.

The church sits on a hillside near Aguilar de Campoo's castle, making it visible from the surrounding landscape. A visit is most easily arranged from the town itself, as the site occupies elevated terrain.

The sources record no tower: the church has a rectangular plan with three naves of three bays under a wooden roof, and a modern trapezoidal apse covered by a ribbed vault. The presbytery vault is pointed. A 1960s restoration saved the building from ruin, and it was declared a monument on 9 October 1963.