Capuchins are a branch of an Order of Franciscan Friars which was founded by Saint Franjo Asiški. In 1517, the Order was divided to Observants and Conventuals. In 1525, one branch separated from the Observants and called itself ‘Capuchin’. Capuchins, as a Franciscan Order, during their long and rich history, in different eras, have developed a versatile apostle-pastoral role among the different social classes of people, and in the Church, next to the Jesuits, they were particularly prominent working on the Catholic revival. They came to Osijek from Budim in 1701. The monastery and the church were built on the property owned by Ivan Jakov von Eggendorff which he had donated to the Capuchins. The monastery was completed in 1710. Alongside the preserved treasure, Franciscan Capuchins also possess a valuable library through which we can witness the long and prolific activity of Osijek monastery and its significance and contribution to the entire religious and cultural life of people from Osijek and Slavonija. The library was probably formed at the same time as the monastery, however, the information is mostly secondary. The library has no incunables, nonetheless, there are over 26 works from the 16th Century and around 10 000 volumes. Latin and German are the most represented after Croatian, and there is a certain amount of works in Hungarian. The greatest part of the materials is contextually related to different church and religious contents. One of the key problems is the insufficient space of the library itself and the inaccessibility of the materials to the wider public. Furthermore, the library is uncatalogued, there is just a list of certain parts of the rare books. Today, brothers Capuchins are investing a lot of effort to keep pace with the current needs and to spread the Church Gospel in today´s society. In addition, they are constantly working on a spiritual renewal, and actively trying to incorporate the Church´s evangelic efforts while remaining faithful to their own Franciscan – Capuchin roots.