The 1965–66 Yugoslav Second League season was the 20th season of the Second Federal League (), the second level association football competition of SFR Yugoslavia, since its establishment in 1946. The league was contested in two regional groups (West Division and East Division), with 18 clubs each, two more than in the previous season.
West Division
Teams A total of eighteen teams contested the league, including thirteen sides from the 1964–65 season and five sides promoted from the third-tier leagues played in the 1964–65 season. The league was contested in a double round robin format, with each club playing every other club twice, for a total of 34 rounds. Two points were awarded for wins and one point for draws.
There were no teams relegated from the 1964–65 Yugoslav First League. The five clubs promoted to the second level were Bosna, Leotar, Segesta, Slovan and Zadar. At the winter break, Slovan abandoned competition due to lack of funding.
Team Location Federal subject Positionin 1964–65Borac Banja LukaBanja Luka0088thBorovoBorovo Naselje01010thBosnaVisokoČelikZenica0055thFamos HrasnicaHrasnica0099thIstraPula01414thLeotarTrebinjeLokomotiva ZagrebZagreb01111thMariborMaribor0033rdSlavonija OsijekOsijek0066thRudar KakanjKakanj0077thSegestaSisakSlobodaTuzla0022ndSlovanLjubljanaRNK SplitSplit01212thŠibenikŠibenik0044thVarteksVaraždin01313thZadarZadar
League table
East Division
Teams A total of eighteen teams contested the league, including thirteen sides from the 1964–65 season, one club relegated from the 1964–65 Yugoslav First League and four sides promoted from the third-tier leagues played in the 1964–65 season. The league was contested in a double round robin format, with each club playing every other club twice, for a total of 34 rounds. Two points were awarded for wins and one point for draws.
Sutjeska were relegated from the 1964–65 Yugoslav First League after finishing in the 15th place of the league table. The four clubs promoted to the second level were Lovćen, Radnički Sombor, Sloboda Titovo Užice and Sloga Kraljevo.
Team Location Federal subject Positionin 1964–65BačkaBačka Palanka SAP Vojvodina0099thBorBor01414thBorac ČačakČačak01010thBudućnostTitograd0033rdLovćenCetinjeNovi SadNovi Sad SAP Vojvodina0066thPobedaPrilep01212thPrishtinaPristina SAP Kosovo0077thProleter ZrenjaninZrenjanin SAP Vojvodina0022ndRadnički SomborSombor SAP VojvodinaSloboda Titovo UžiceTitovo UžiceSloga KraljevoKraljevoSpartak SuboticaSubotica SAP Vojvodina0088thSremSremska Mitrovica SAP Vojvodina0055thSutjeskaNikšićTrepčaKosovska Mitrovica SAP Kosovo01313thVoždovačkiBelgrade01111thŽelezničar NišNiš0044th
League table
See also 1965–66 Yugoslav First League 1965–66 Yugoslav Cup