1989–90 Alpha Ethniki
The 1989–90 Alpha Ethniki was the 54th season of the highest football league of Greece. The season began on 17 September 1989 and ended on 27 May 1990. Panathinaikos won their 15th Greek title and their first one in four years.
The point system was: Win: 2 points - Draw: 1 point.
Teams
| Promoted from 1988–89 Beta Ethniki | Relegated from 1988–89 Alpha Ethniki |
| Xanthi Panserraikos Ionikos | Ethnikos Piraeus Diagoras Apollon Kalamarias |
League table
Top scorers
| Rank | Player | Club | Goals |
| 1 |  AttendancesPanathinaikos drew the highest average home attendance in the 1989–90 Alpha Ethniki. |