The 2019–20 First League of the Republika Srpska was the twenty-fifth season of the First League of the Republika Srpska, the second tier football league of Bosnia and Herzegovina, since its original establishment and the eighteenth as a second tier league. The season began on 10 August 2019 and ended abruptly on 8 May 2020 due to the COVID-19 pandemic in Bosnia and Herzegovina, with Krupa getting promoted to the Premier League of Bosnia and Herzegovina and no one getting relegated. Earlier in the season, Sloga Gornje Crnjelovo withdrew from the league after only two rounds.