| Prevseason: | 2019–20 |
| Nextseason: | 2021–22 |
| Korisliiga | |
| T Bg: |
|
| T Color: | white; border: solid 2px #F8811B |
| Duration: | 13 October 2020 – 14 May 2021 |
| Season: | 2020–21 |
| Champions: | Vilpas Vikings 1st title |
| Runners Up: | Kauhajoki |
| Third Place: | Helsinki Seagulls |
| Fourth Place: | Pyrintö |
| Relegated: | - |
| Teams: | 12 |
The 2020–21 Korisliiga season was the 81st season of the top professional basketball league in Finland. Vilpas Vikings won its first-ever national championship.
The twelve teams would play two times against each one of the other teams for a total of 22 games. Then league splits into two groups (one with the first 6 teams and the other with the last 6 teams) and each team plays two games against each one of the teams from the same group (for a total of 10 games). The six teams from the first group and the best two teams from the second group would join the playoffs. The last team would be directly relegated.[1]
No teams promoted, nor relegated.
| Team | City | Arena | |
|---|---|---|---|
| Helsinki Seagulls | Helsinki | Töölö Sports Hall | |
| Kataja | Joensuu | LähiTapiola Areena | |
| Karhu | Kauhajoki | Kauhajoen Yhteiskoulu | |
| Kobrat | Lapua | Lapuan Urheilutalo | |
| Korihait | Uusikaupunki | Pohitullin Sports Hall | |
| Kouvot | Kouvola | Mansikka-Ahon Urheiluhalli | |
| KTP | Kotka | Steveco-Areena | |
| Lahti | Lahti | Energia Areena | |
| Nokia | Nokia | Nokian Palloiluhalli | |
| Pyrintö | Tampere | Pyynikin Palloiluhalli | |
| Salon Vilpas | Vilpas | Salohalli | |
| Ura eGameStars | Kaarina | Kupittaan palloiluhalli |