The Monastery of Santa Cruz de Ribas, also called Santa Cruz de la Zarza, is a semi-ruined Spanish monastery of the Premonstratensian order. Located in the low valley of the Carrión River, it is situated between Ribas de Campos and Monzón de Campos, in the region of Tierra de Campos in Province of Palencia, Castile and León. The building was constructed in a transitional style between Romanesque and Gothic. The building is indexed in the Spanish heritage register of Bien de Interés Cultural under the reference RI-51-0000811.