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The flag of Republika Srpska within Bosnia and Herzegovina was adopted on 24 November 1992. The flag is a rectangular tricolour with three equal horizontal bands of red, blue and white. It is similar to the civil flag of Serbia. While the Constitutional Court of Bosnia and Herzegovina declared the coat of arms of Republika Srpska unconstitutional, claiming that it did not represent the non-Serb ethnicities living in the entity, the flag was deemed to be in line with the constitution. The court ruled that though the combination of the colours relates to the Serbian tricolor, the use of red, blue and white are considered to be pan-Slavic colors as well.

Source: Wikipedia