Day of Republika Srpska (Serbo-Croatian: Dan Republike Srpske / Дан Републике Српске) is a formerly official national holiday of the Republika Srpska, which has been proclaimed unconstitutional by the Constitutional Court of Bosnia and Herzegovina.

Constitutional Court of Bosnia and Herzegovina declared the holiday unconstitutional on 26 November 2015[3] stating that the main issue for it being coinciding with a religious holiday.

[citation needed] The ruling was ignored by the Republika Srpska government.

As recently as 2021, participants took part in celebrating the disputed Day of Republika Srpska, ignoring condemnation from Bosniak leaders and a ban imposed by the country's Constitutional Court.

Despite the court ruling that the holiday was unconstitutional, and fierce criticism by Bosniaks and part of the international community, celebrations took place throughout Republika Srpska, including parades and performances.