| Prevseason: | 2019–20 |
| Nextseason: | 2021–22 |
| Greek Basket League | |
| Season: | 2020–21 |
| Champions: | Panathinaikos (39th title) |
| Runners Up: | Lavrio |
| Third Place: | AEK |
| Teams: | 12 |
| Dates: | October 24 2020 – June 2021 |
| Ppg: | 382 |
| Rpg: | 162 |
| Apg: | 138 |
The 2020–21 Greek Basket League, also known as the 2020–21 Stoiximan Greek Basket League for sponsorship reasons, is the 81st season of the Greek Basket League, the top-tier level professional club basketball league in Greece. The season begun on 24 October 2020.
| Club | Location | Arena | Capacity | ||
|---|---|---|---|---|---|
| AEK | Athens (Marousi) | OAKA Indoor Hall | align=center | ||
| Aris | Thessaloniki | Alexandrio Melathron | align=center | ||
| Messolonghi | Agrinio | Agrinio Indoor Hall | align=center | ||
| Ionikos | Piraeus (Nikaia) | Platon Indoor Hall | |||
| Iraklis | Thessaloniki | Ivanofeio Sports Arena | |||
| Kolossos | Rhodes | Kallithea Palais des Sports | align=center | ||
| Larisa | Larissa | Neapolis Indoor Arena | align=center | ||
| Lavrio | Lavrio | Lavrio Indoor Hall | align=center | ||
| Panathinaikos | Athens (Marousi) | OAKA Indoor Hall | align=center | ||
| PAOK | Thessaloniki (Pylaia) | PAOK Sports Arena | align=center | ||
| Peristeri | Athens (Peristeri) | Peristeri Arena | align=center | ||
| Promitheas | Patras | Dimitris Tofalos Arena | align=center | ||
The eight highest ranked teams in the regular season qualified for the playoffs. Quarterfinals will be played in a Best of 3 format while the rest of the series will be played in a Best of 5 format.
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| width=30 | width=100 | Team | width=30 | width=30 | width=30 | Qualification or Relegation | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Panathinaikos | 32 | 28 | 4 | Qualification to the EuroLeague | |||||
| 2 | Lavrio | 33 | 23 | 10 | Qualification to the Basketball Champions League | |||||
| 3 | AEK | 33 | 20 | 13 | ||||||
| 4 | Promitheas | 34 | 21 | 13 | Qualification to the EuroCup | |||||
| 5 | PAOK | 25 | 14 | 11 | Qualification to the Basketball Champions League | |||||
| 6 | Peristeri | 25 | 12 | 13 | ||||||
| 7 | Kolossos | 24 | 8 | 16 | ||||||
| 8 | Ionikos | 24 | 8 | 16 | Qualification to the FIBA Europe Cup | |||||
| 9 | Aris | 22 | 7 | 15 | ||||||
| 10 | Iraklis | 22 | 7 | 15 | Qualification to the FIBA Europe Cup | |||||
| 11 | Larisa | 22 | 6 | 16 | ||||||
| 12 | Messolonghi | 22 | 5 | 17 | Relegation to the Greek A2 League |
| Pos. | All-Greek League First Team | ||
| PG | Vasilis Mouratos | Lavrio | |
| SG |  Tyson Carter | Lavrio | |
| SF | Ioannis Papapetrou (MVP) | Panathinaikos | |
| PF | Dinos Mitoglou | Panathinaikos | |
| C | Georgios Papagiannis | Panathinaikos | |
| Pos. | All-Greek League Second Team | ||
| PG | Jerian Grant | Promitheas Patras | |
| SG | Daryl Macon | AEK | |
| SF | Mario Hezonja | Panathinaikos | |
| PF | Alpha Diallo | Lavrio | |
| C |  Kerem Kanter | Kolossos Rodou | |
| All-Greek League Defensive Team[4] | |||
| PG | Vasilis Mouratos | Lavrio | |
| SG | Michalis Lountzis | Promitheas Patras | |
| SF |  Howard Sant-Roos (Best Defender) | Panathinaikos | |
| PF | Kerem Kanter | Kolossos Rodou | |
| C | Danny Agbelese | Promitheas Patras | |
| Team | Competition | Result |
|---|---|---|
| EuroLeague | Regular season, 16th place | |
| Promitheas | EuroCup | Regular season, 6th place |
| FIBA Champions League | Playoffs, Top-16, 3rd place | |
| Regular season, 3rd place | ||
| Qualification Group B, Semifinals | ||
| FIBA Europe Cup | Playoffs, Quarterfinals |
