The Sinful Nuns of Saint Valentine () is a 1974 Italian nunsploitation horror film co-written and directed by Sergio Grieco and starring Françoise Prévost and Jenny Tamburi.
In the 16th century, two Spanish lovers are divided by the rivalry of their families. She then confines herself in a convent, and while the man searches for her, the abbess of the convent falls in love with him, hindering his research and carrying the girl to the Inquisition.