Henricus Calenus (1583–1653), born Hendrik van Caelen, was a 17th-century Roman Catholic prelate and theologian in the Spanish Netherlands. He served as a significant ecclesiastical figure within the Archdiocese of Mechelen and held the title of titular Bishop of Seleucia.
Calenus was born in Braine-l'Alleud and rose through the clerical ranks to become the archpriest of the Cathedral of St. Michael and St. Gudula in Brussels. He subsequently served as the vicar general for the Archbishop of Mechelen, Jacobus Boonen. In 1648, he was appointed as a titular bishop, a role that allowed him to exercise episcopal functions in support of the archdiocese.
Historically, Calenus is noted for his role in the Jansenist controversy, a theological conflict within the Catholic Church regarding grace and human nature. Although his superior, Archbishop Boonen, was initially hesitant to enforce papal decrees against the movement, Calenus was a firm opponent of Jansenism. He advocated for the official condemnation of the "Five Propositions" attributed to Cornelius Jansen and worked to ensure the promulgation of the papal bull Cum occasione in his jurisdiction. His administrative and polemical activities were directed toward upholding the authority of the Holy See and maintaining Counter-Reformation orthodoxy in the Southern Netherlands.
