The current, traditional Latin-type civil law notaries do not exist within the organisation of the Roman Catholic Church. However, the ecclesiastical “notary” and the concept, function and activities of the civil law notary may be related, and even made parallel, which may support the idea of some common origin or development. My article discusses the reason why we may still speak of persons having quasi notarial competence within the church. Also, it purportsto describe the diplomatic mission of the Vatican, the tasks of the embassy, touching on the issue of legalization as well; moreover, it draws a parallel between the ecclesiastical clerk and the civil law notary from the aspect of civil legal principles, such as impartiality and independence, comparing them also in terms of appointment and similar elements concerning attestations. It covers the rules governing the preparation of instruments and the certification of copies in more detail, as well as the procedural function of the ecclesiastical clerk, the similarities concerning archives and the custody of documents, and finally presents the issue of removability and termination of office.