On 6 November 1806, Bishop Antun Mandić founded the Theological Seminary and the Lyceum episcopale in Đakovo, thereby initiating the institutional education of future priests in this part of Croatia. This year marks the beginning of the rich tradition of philosophical-theological studies in Đakovo.

The demolition of the old Seminary building began, along with the construction of a new library and seminary building, which was completed in 1914. This building remained the central location of the library’s activities until 2003.

Through the Apostolic Constitution Deus scientiarum Dominus, the school in Đakovo received the title “School of Theology,” and the program was extended to five years. This strengthened the academic character and recognition of the theological institution.

The theological studies in Đakovo began to align with the new ecclesiastical guidelines. Reforms were introduced into the curriculum, emphasizing active student participation and the modernization of teaching.

The Statute of the Catholic Faculty of Theology in Zagreb was used as the basis for regulating the functioning of the Theological School in Đakovo. This enhanced academic alignment and organizational structure.

On 10 January 1987, the Congregation for Catholic Education confirmed the affiliated status of the Higher Theological School in Đakovo with the Catholic Faculty of Theology in Zagreb, thereby integrating the school into the university network.

The building from 1857 (St. Bonaventure) was adapted for the needs of the teaching process. The Theological School was given the name: “Theology in Đakovo – Affiliated Study Program of the Catholic Faculty of Theology in Zagreb.”

On 15 April 1996, Bishop Ćiril Kos founded the Central Diocesan Library, which integrated valuable historical collections and became the foundation for a future modern scientific library.

In June 1997, the construction and furnishing of the new library began, with the aim of providing modern conditions for students and professors, as well as housing the valuable library collection.

On 28 February 2000, the Statute of Theology in Đakovo came into force, in accordance with the legislation of the Republic of Croatia, thereby further regulating the academic and administrative status of the program.

On 7 November 2003, Đakovo-Bosnian Bishop Marin Srakić submitted an official request to the Congregation for Catholic Education in Rome for the establishment of an independent Catholic Faculty of Theology in Đakovo.

On 10 May 2005, Bishop Marin Srakić blessed the new library building. The new facility includes a reading room, storage areas, and workspaces, and it is still in use today.