Knjižnica bogoslovnog sjemeništa i visokog teološkog učilišta osnovana je najvjerojatnije istovremeno s matičnim ustanovama. To je bilo 1806. godine kada je radom započelo sjemenište i visoko teološko učilište, ta visokoškolska ustanova, stoljeće i pola jedina na području sjevernoga Jadrana, koju je1804. godine osnovao biskup Ivan Krstitelj Ježić i koja je djelovala uz manji prekid (1919.- 1933.) sve do 1940. godine. Zavod je bio smješten u zgradi staroga franjevačkoga samostana, koja je 1816. godine obnovljena nakon požara koji ju je zadesio 1810. godine, kada su stradali arhiv i knjižnica ovoga zavoda. Zgradu zavoda krajem XIX. stoljeća temeljito obnavlja biskup dr. Antun Maurović. Uoči II. svjetskoga rata, 1940. godine biskup dr. Viktor Burić zatvara ovaj zavod. Zgrada je u II. svjetskome ratu stradala u bombardiranju grada, namještaj je najvećim dijelom raznesen, a ni knjižni fond nije bio pošteđen. Nakon 1945. godine zgrada sjemeništa nacionalizirana je i koristi se sve do danas za smještaj gradske uprave i ugostiteljske namjene. Knjižnica sjemeništa smještena je u neadekvatne skladišne prostore, gdje je nastavljeno njezino stradanje. Uređenjem svećeničkoga doma stvoreni su uvjeti za smještaj knjižnica različitih biskupijskih ustanova. U novonastaloj Knjižnici biskupija senjske i modruške (Sakralna baština u Senju) našle su se i preostale knjige iz nekadašnje knjižnice senjskoga sjemeništa. U ovome radu daje se povijest nastanka, sudbina knjižnice i pregled fonda na osnovi postojećih kataloga/inventara i uočenih primjeraka knjižne građe u novonastaloj knjižnici.The library of the theological seminary and of the High theological school was most probably established at the same time as the registry institutions. In 1806, the seminary and High theological school started with work; the High school, established by Bishop Ivan Krstitelj Ježić in 1804, was operating, with short breaks (1919- 1933), for a century and a half as the only one in the North Adriatic till 1940. The institution was located in the building of the old Franciscan monastery. The building was renewed in 1816 after the fire of 1810, when the archive and the library were destroyed. Bishop Dr. Antun Maurović had the building completely renewed by the end of XIX century. Bishop Dr. Viktor Burić closed the institution in 1940. In the II World War during bombing of the town, the building, furniture and the library were ruined. After 1945 the building of the Seminary was nationalized, and since then it has been used to locate municipal authorities and catering necessities. The inventory and the library were moved to an inadequate warehouse, and the deterioration continued. By arrangement of the clerical home, room was provided for libraries that belong to different institutions of dioceses. The remaining books from the former Library of Senj seminary were placed in the new Library of Senj and Modruša in Sacral heritage of Senj. Today we can talk about this library on the basis of four inventory books that served as catalogues too. The Library had around 5.000 titles/volumes. It mainly consisted of theological, legal, historical and linguistic literature of older period, and later it contained literature of more modern social and natural sciences. Documents are in various languages, and the Croatian language prevails in recent times. The golden time of the Library was form the middle till the end of XIX century, i.e. when it was closed down in 1919. Today this material, though not completely saved, is a monument of time and an effort not just to educate priests, intellectuals but also to keep the national identity. Thus, it is necessary to elaborate and put it at the disposal of the potential users