The 1966–67 Yugoslav Second League season was the 21st 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.
A total of eighteen teams contested the league, including fourteen sides from the 1965–66 season, one club relegated from the 1965–66 Yugoslav First League and three sides promoted from the third tier leagues played in the 1965–66 season.
The three clubs promoted to the second level were Aluminij, Bratstvo Travnik and BSK Slavonski Brod.
A total of eighteen teams contested the league, including fourteen sides from the 1965–66 season, one club relegated from the 1965–66 Yugoslav First League and three sides promoted from the third tier leagues played in the 1965–66 season.
The three clubs promoted to the second level were Crvenka, Rabotnički and Radnički Kragujevac.