The dictionary is dedicated to the most important events of the Reformation and the history of Protestantism, one of the most widespread, along with Orthodoxy and Catholicism, areas of Christianity. The purpose of the publication is to become an initial guideline in acquaintance with the most significant, according to the compiler, concepts and personalities of the Reformation and Protestantism. Priority is given to the disclosure of the doctrinal and theological aspects of Protestantism, the history of the formation of its main varieties. The dictionary includes one hundred articles covering topics, a bibliography of publications on this topic in Russian, an index of names and titles.