Christian religious orders established in the 16th century

The Piarists (), officially named the Order of Poor Clerics Regular of the Mother of God of the Pious Schools (), abbreviated SchP, is a religious order of clerics regular of the Catholic Church founded in 1617 by Spanish priest Joseph Calasanz. It is the oldest religious order dedicated to education, and the main occupation of the Piarist fathers is teaching children and youth, the primary goal being to provide free education for poor children. The Piarist practice was to become a model for numerous later Catholic societies devoted to teaching, while some state-supported public school systems

The Barnabites (), officially named as the Clerics Regular of Saint Paul (), are a religious order of clerics regular founded in 1530 in the Catholic Church. They are associated with the Angelic Sisters of Saint Paul and the members of the Barnabite lay movement.