The 1990âÂÂ91 Alpha Ethniki was the 55th season of the highest football league of Greece. The season began on 16 September 1990 and ended on 2 June 1991. Panathinaikos won their second consecutive and 16th Greek title.
The point system was: Win: 2 points - Draw: 1 point.
<onlyinclude></onlyinclude>
Olympiacos drew the highest average home attendance in the 1990âÂÂ91 Alpha Ethniki.