The 1966–68 Liga Leumit season was the thirteenth in the league's history, and is notable for the Israel Football Association's decision to play it over two years as a play to combat corruption and increasing violence at matches. The sixteen teams played each other four times during the season, effectively combining two seasons into one, leading it to be known as the double season (Hebrew: העונה הכפולה, HaOna HaKfula).
The season began with a protests from relegated players, with the uproar reaching as far as the Knesset. In an attempt to restore order to the game and solve the issues raised, the IFA decided to spread the league games over two years instead of one. The main objectives were to put an end to the riots on the field, reducing trouble at matches and improve the quality of play, as well as infusing new blood into teams by alleviating the immediate fear of relegation.