| Club: | Partizan NIS Belgrade |
| Season: | 2020–21 |
| Chrtitle: | President |
| Chairman: |  Ostoja Mijailović |
| Manager: |  Vlado Šćepanović(until 30 October 2020) Milivoje Lazić(30 October – 5 November) Sašo Filipovski (5 November – 8 March) Aleksandar Matović(from 8 March) |
| Stadium: | Ranko Žeravica Sports Hall |
| League: | Serbian League |
| League Result: | Semi-finals |
| League2: | ABA League |
| League2 Result: | 7th |
| Cup1: | EuroCup |
| Cup1 Result: | Top 16 |
| Cup2: | Radivoj Korać Cup |
| Cup2 Result: | Semi-finals |
| Cup4: | ABA Super Cup |
| Cup4 Result: | Canceled |
| Highest Attendance: | 1,027 vs Mega Soccerbet (3 June 2021) |
| Largest Win: | 71-43 vs Dolomiti Energia Trento (13 January 2021) |
| Largest Loss: | 93-70 vs UNICS (14 October 2020) |
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| H Pattern B: | _blacksides |
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| Prevseason: | 2019–20 |
| Nextseason: | 2021–22 |
In the 2020–21 season, Partizan NIS Belgrade competed in the Serbian League, Radivoj Korać Cup, Adriatic League and EuroCup.
It was the first season after the 1997–98 season that the club missed any league of cup final.[1]
| Partizan NIS players out on loan | |||||
| Player | Position | Team | On loan since | ||
|---|---|---|---|---|---|
| Filip Barna | SG/SF | Mladost Zemun | August 2020[2] | |
| Stefan Janković | C/PF |  Bahçeşehir Koleji | February 2021[3] |
|}
|}
See main article: article and 2020–21 ABA League First Division.
See main article: article and 2020–21 EuroCup Basketball.
See main article: article and 2021 Basketball League of Serbia playoffs.
See main article: 2020–21 Radivoj Korać Cup.
Adriatic League
MVP of the Round
Ognjen Jaramaz – Round 13MVP of the Month
Rashawn Thomas – April