Marianna Fontanella, OCD, also known as Maria degli Angeli or Mary of the Angels, was an Italian Catholic member of the Discalced Carmelites. Fontanella studied with the Cistercians as a child and entered the Discalced Carmelites despite the protests of her mother and siblings. She soon became a noted abbess and prioress and in 1703 inaugurated a new convent of which she herself oversaw the establishment.