Sant Pere de les Puel·les (in Catalan, Puel·les, in Spanish, Real Monasterio de San Pedro de las Puellas) is a Benedictine monastery in the Sant Pere, Santa Caterina i la Ribera neighborhood of the Ciutat Vella district of Barcelona, Catalonia, Spain.
The 10th-century building, Romanesque/Gothic in style, was declared a Bien de Interés Cultural landmark in 1931.
A nunnery was founded by Count Sunyer I and his wife Richilda of Toulouse next to an ancient church dedicated to Saint Saturnin.
In 1879, the religious community moved to a new location in the district of Sarrià-Sant Gervasi.
In the area where the present chapel of the Blessed is located, there are remains of the old church of Saint Saturnin which predates Sant Pere de les Puel·les.