| Club: | B-SAD |
| Season: | 2021–22 |
| Chrtitle: | Chairman |
| Chairman: | Rui Pedro Soares |
| Mgrtitle: | Manager |
| Manager: | Petit |
| Stadium: | Estádio Nacional |
| League: | Primeira Liga |
| League Result: | 18th |
| Cup1: | Taça de Portugal |
| Cup1 Result: | Fifth round |
| Cup2: | Taça da Liga |
| Cup2 Result: | First round |
| Pattern La1: | _belenenses1718h |
| Pattern B1: | _belenenses1920h |
| Pattern Ra1: | _belenenses1718h |
| Leftarm1: | 0000FF |
| Body1: | 0000FF |
| Rightarm1: | 0000FF |
| Shorts1: | FFFFFF |
| Socks1: | 0000FF |
| Pattern La2: | _belenenses1718a |
| Pattern B2: | _belenenses1920a |
| Pattern Ra2: | _belenenses1718a |
| Leftarm2: | 0000FF |
| Body2: | FFFFFF |
| Rightarm2: | 0000FF |
| Shorts2: | 0022FF |
| Socks2: | FFFFFF |
| Pattern La3: | _belenenses1718t |
| Pattern B3: | _belenenses1920t |
| Pattern Ra3: | _belenenses1718t |
| Leftarm3: | 0000FF |
| Body3: | FFFFFF |
| Rightarm3: | 0000FF |
| Shorts3: | 000066 |
| Socks3: | 000066 |
| Prevseason: | 2020–21 |
| Nextseason: | 2022–23 |
The 2021–22 season was the 4th season in the existence of B-SAD and the club's third consecutive season in the top flight of Portuguese football. In addition to the domestic league, B-SAD participated in this season's editions of the Taça de Portugal and the Taça da Liga.
See main article: 2021–22 Primeira Liga.
See main article: 2021–22 Taça de Portugal.
See main article: 2021–22 Taça da Liga.