The Carmelite sect, founded by Christian pilgrims and Crusaders on Mount Carmel in Jerusalem in 1155, was based on the origins of the Prophet Ilyas and Elyesa and was active in the geography where they were founded until the 13th century, and later in Europe and America. The Carmelites, a very important sect among the Catholic Christian sects, accepted to keep themselves away from the blessings of the world, to serve humanity and to punish their own souls for their sins as the general rules of their sects. However, it has been a question of whether this sect, which seems so humanistic, nurtures the same feeling for Muslims. Thus, when we look at the place and time it was founded, it is seen that the period was the period of the Crusade Wars which caused severe destruction in the Islamic world. Over time, this Jerusalem-based sect had the opportunity to spread among European countries and worked to protect Christians against Muslims as it was in its foundation years. In Austria, which is one of the European countries, this sect was very effective and during the Siege of Vienna II, they provided important assistance behind the war against the Turks. This study focuses on the emergence of the Carmelite sect, its missions, the reasons for its expansion into Europe, and in particular its activities in Austria and the problems it experienced in Austria during the period from 1622 to 1780, the supports it received and its services on behalf of Christianity are given in detail. In this study, generally, German works of the 18th and 19th centuries were used, and the information given in the works was supported by the newspaper reports of the time and the information in the contemporary media organs of the Carmelites