This thesis explores the history and development of the State Archives in Bjelovar which begins its work in 1961. under the name Historical (hrv. Historijski) Archives in Bjelovar. The National District Committee of Bjelovar, after an agreement with the National District Committees of Križevci and Daruvar, has made a decision to establish the Archive in June 1961. The first decision on the territorial jurisdiction of the Archive was made in 1963. Due to changes in the socio-political system in the early 1990s, the Archives changed its name to the Historical (hrv. Povijesni) Archives in Bjelovar. By adopting the new law in 1997, the Archive changed its name to the State Archives in Bjelovar, which it has retained to this day. In the year 2000, the Archive initiated the project of building a new archive repository. Construction began in 2002 and finished in 2004. The last jurisdictional change occurred in 2008 with the establishment of new archives in Križevci and Virovitica. A complete chapter provides a focused view of the organization and distribution of work of the State Archives in Bjelovar, with particular emphasis on the work and tasks of the Department of arrangement and description of archival materials, as well as the Service for protection of archival and registry materials outside the archives. This thesis also discusses the acquisition policy of the archives, according to which the Archive takes over ex officio archival and registry materials created by the work of state bodies, institutions, public companies and other public services whose activities are carried out within the jurisdiction of the State Archives in Bjelovar. The final section describes the services that the Archive provides to its users and the community.