1998–99 Alpha Ethniki
The 1998–99 Alpha Ethniki was the 63rd season of the highest football league of Greece. The season began on 22 August 1998 and ended on 30 May 1999. Olympiacos won their third consecutive and 28th Greek title.
Teams
Stadia and personnel
| Team | Manager1 | Location | Stadium |
| AEK Athens |  Oleg Blokhin | Athens | Nikos Goumas Stadium |
| Apollon Athens |  Andreas Michalopoulos | Athens | Rizoupoli Stadium |
| Aris | Alketas Panagoulias | Thessaloniki | Kleanthis Vikelidis Stadium |
| Ethnikos Asteras | Spyros Livathinos | Athens | Michalis Kritikopoulos Stadium |
| Ethnikos Piraeus | Panagiotis Alexopoulos | Piraeus | Karaiskakis Stadium |
| Ionikos |  Sergio Markarián | Piraeus | Neapoli Stadium |
| Iraklis |  Mats Jingblad | Thessaloniki | Kaftanzoglio Stadium |
| Kavala | Makis Katsavakis | Kavala | Kavala National Stadium |
| OFI |  Eugène Gerards | Heraklion | Theodoros Vardinogiannis Stadium |
| Olympiacos |  Dušan Bajević | Piraeus | Athens Olympic Stadium |
| Panathinaikos | Vassilis Daniil | Athens | Athens Olympic Stadium |
| Panelefsiniakos | Stathis Stathopoulos | Elefsina | Municipal Stadium of Elefsina |
| Paniliakos | Babis Tennes | Pyrgos | Pyrgos Stadium |
| Panionios |  Ronnie Whelan | Nea Smyrni | Nea Smyrni Stadium |
| PAOK | Arie Haan | Thessaloniki | Toumba Stadium |
| Proodeftiki | Nikos Alefantos | Piraeus | Nikaia Municipal Stadium |
| Skoda Xanthi | Giannis Matzourakis | Xanthi | Xanthi Ground |
| Veria | Petros Ravousis | Veria | Veria Stadium |
Results
Top goalscorers
| Rank | Player | Club | Goals |
| 1 |  Demis Nikolaidis | AEK Athens | 22 |
| 2 | Nikos Frousos | Ionikos | 18 |
| 3 |  Leszek Pisz | Kavala | 14 |
| 3 |  Ismail Ba | Skoda Xanthi | 14 |
| 5 | Nikos Liberopoulos | Panathinaikos | 13 |
| 5 | Christos Maladenis | AEK Athens | 13 |
| 5 |  Paulo Andrioli | Ionikos / Aris | 13 |
| 8 | Grigoris Georgatos | Olympiacos | 12 |
| 8 | Krzysztof Warzycha | Panathinaikos | 12 |
| 10 | Apostolos Liolidis | Aris | 11 |