Catherine of Ricci, born Alessandra Lucrezia Romola de' Ricci, was a 16th-century Italian nun of the Dominican Third Order. Born in Florence in 1522, she entered a convent in Prato at the age of thirteen and eventually served as prioress starting in her mid-twenties. She is primarily recognized for her intense spiritual life, which included reported mystical experiences and extreme acts of penance. Beyond her monastic duties, she maintained a significant influence through correspondence with several future popes.