Republika Srpska (1992–1995)

Republika Srpska (RS; Serbian Cyrillic: Република Српска, lit. 'Serbian Republic', pronounced [repǔblika sr̩̂pskaː] ^ⓘ) was an unrecognized geopolitical entity and a self-proclaimed Serb quasi-state in Southeastern Europe under the control of the Army of Republika Srpska during the Bosnian War. It claimed to be a sovereign state, though this claim was only partially recognized by the Bosnian government (whose territory the RS was recognized as nominally being a part of) in the Geneva agreement, the United Nations, and FR Yugoslavia. For the first six months of its existence, it was known as the Serbian Republic of Bosnia and Herzegovina (Serbian: Српска Република Босна и Херцеговина / Srpska Republika Bosna i Hercegovina).

After 1995, the Republika Srpska was recognized as one of the two political entities composing Bosnia and Herzegovina. The borders of the post-1995 RS are, with a few negotiated modifications, based on the front lines and situation on the ground at the time of the signing of the Dayton Agreement on 14 December 1995. As such, the entity is primarily a result of the Bosnian War without any direct historical precedent. Its territory encompasses a number of Bosnia and Herzegovina's numerous historical geographic regions, but (due to the above-mentioned nature of the inter-entity boundary line) it contains very few of them in entirety. Likewise, various political units existed within Republika Srpska's territory in the past but very few existed entirely within the region.