1979–80 Alpha Ethniki
The 1979–80 Alpha Ethniki was the 44th season of the highest football league of Greece. From that season Alpha Ethniki became the professional league. The season began on 30 September 1979 and ended on 25 May 1980 with the play-off matches. Olympiacos won their 21st Greek title and their first one in five years.
The point system was: Win: 2 points - Draw: 1 point.
Teams
| Promoted from 1978–79 Beta Ethniki | Relegated from 1978–79 Alpha Ethniki |
| Korinthos Doxa Drama | Kavala Egaleo Panserraikos |
League table
Top scorers
| Rank | Player | Club | Goals |
| 1 |  AttendancesOlympiacos drew the highest average home attendance in the 1979–80 Alpha Ethniki. |