1965–66 Alpha Ethniki

The 1965–66 Alpha Ethniki was the 30th season of the highest football league of Greece. The season began on 28 November 1965 and ended on 19 June 1966. Olympiacos won their 16th Greek title and their first in seven years.

The point system was: Win: 3 points - Draw: 2 points - Loss: 1 point.