The 1920–21 Slovenian Republic League was the second season of the Slovenian Republic League. The league was separated into Celje, Ljubljana and Maribor subdivisions.[1] The final was played between the previous season winners Ilirija and Athletik. The first two games ended with a draw (4–4 and 1–1). The third game ended 7–2 for Ilirija, which won their second title in a row.[1]