In the modern World, Catholic Church is presented by two different legal institutions i.e. The Catholic University and The Ecclesiastical University. Author of the article describes the beginning and development of the University, which was catholic and ecclesiastical on the beginning of its existence. Actually, these two independent legal institutions have common elements, which appeared from the nature of the university itself. Therefore, the conception of the University was expressed in Charta Magna of the European Universities and then referred to Catholic and Ecclesiastical Universities. Also, the differences between these two types of Universities were presented at the end of the article.