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.
Teams
| Promoted from 1964–65 Beta Ethniki | Relegated from 1964–65 Alpha Ethniki |
| Egaleo Panserraikos | Apollon Kalamarias Doxa Drama |
League table
Top scorers
| Rank | Player | Club | Goals |
| 1 |  |oldAttendancesOlympiacos drew the highest average home attendance in the 1965–66 Alpha Ethniki. |