| Club: | C.S. Marítimo |
| Season: | 2021–22 |
| Chrtitle: | Chairman |
| Chairman: | Carlos Pereira |
| Mgrtitle: | Manager |
| Manager: | Julio Velázquez |
| Stadium: | Estádio do Marítimo |
| League: | Primeira Liga |
| League Result: | 12th |
| Cup1: | Taça de Portugal |
| Cup1 Result: | Pre-season |
| Cup2: | Taça da Liga |
| Cup2 Result: | First round |
| Pattern B1: | _maritimo2021h |
| Leftarm1: | 007700 |
| Body1: | 007700 |
| Rightarm1: | 007700 |
| Shorts1: | 007700 |
| Socks1: | FF0000 |
| Pattern B2: | _nikechallenge3rb |
| Leftarm2: | 0000FF |
| Rightarm2: | 0000FF |
| Shorts2: | 000080 |
| Socks2: | 0000FF |
| Pattern La3: | _nikestrike3 |
| Pattern B3: | _nikestrike3bb |
| Pattern Ra3: | _nikestrike3 |
| Leftarm3: | 000000 |
| Body3: | 000000 |
| Rightarm3: | 000000 |
| Shorts3: | 000000 |
| Socks3: | 000000 |
| Prevseason: | 2020–21 |
| Nextseason: | 2022–23 |
The 2021–22 season is the 72nd season in the existence of C.S. Marítimo and the club's third consecutive season in the top flight of Portuguese football. In addition to the domestic league, C.S. Marítimo are participating in this season's edition 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.