The 1979–80 Yugoslav Second League season was the 34th season of the Second Federal League (Serbo-Croatian: Druga savezna liga), the second level association football competition of SFR Yugoslavia, since its establishment in 1946.
The four clubs promoted to the second level were Istra Pula, Jedinstvo Bihać, Rudar Trbovlje and Vrbas.
The four clubs promoted to the second level were Bor, Pobeda, Prishtina and OFK Titograd.
Due to suspicion of match fixing in the last round of the league, Football Association of Yugoslavia penalized the top three clubs and Galenika Zemun earned a promotion spot to the Yugoslav First League.
However, after an appeal in summer 1980 that decision was retracted and OFK Belgrade was promoted.