The Army of Republika Srpska, commonly referred to in English as the Bosnian Serb Army, was the military of Republika Srpska, the self-proclaimed Serb secessionist republic, a territory within the newly independent Bosnia and Herzegovina, which it defied and fought against. Active during the Bosnian War from 1992 to 1995, it continued to exist as the armed forces of RS, one of two entities making up Bosnia and Herzegovina, until 2006 when it was integrated into the Armed Forces of Bosnia and Herzegovina. Forces of the VRS engaged in several campaigns, including Operation Corridor 92, Operation Vrbas '92, Operation Bura, and Operation Spider; they were also involved in the siege of Sarajevo, as well as the Srebrenica massacre.

The Republika Srpska was a self-proclaimed statelet 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 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.