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The Republic of Serbian Krajina or Serb Republic of Krajina (Serbian: Република Српска Крајина / Republika Srpska Krajina, pronounced [rɛpǔblika sr̩̂pskaː krâjina]; abbr. РСК / RSK), known as the Serbian Krajina (Српска Крајина / Srpska Krajina) or simply Krajina (Крајина), was an unrecognized geopolitical entity and a self-proclaimed Serb quasi-state, a territory within the newly independent Republic of Croatia (formerly part of Socialist Yugoslavia), which it defied, and which was active during the Croatian War of Independence (1991–95). It was not recognized internationally. The name Krajina ("Frontier") was adopted from the historical Military Frontier of the Habsburg monarchy (Austria-Hungary), which had a substantial Serb population and existed up to the late 19th century. The RSK government waged a war for ethnic Serb independence from Croatia and unification with the Federal Republic of Yugoslavia and Republika Srpska (in Bosnia and Herzegovina).
The government of Krajina had de facto control over central parts of the territory while control of the outskirts changed with the successes and failures of its military activities. The territory was legally protected by the United Nations Protection Force (UNPROFOR). Its main portion was overrun by Croatian forces in 1995 and the Republic of Serbian Krajina was ultimately disbanded as a result. A rump remained in eastern Slavonia under UNTAES administration until its peaceful reintegration into Croatia in 1998 under the Erdut Agreement.