| Clubname: | Marítimo Under-23 |
| Upright: | 0.7 |
| Fullname: | Club Sport Marítimo Under-23 |
| Nickname: | Os Verde-Rubros (The Green-and-Reds) Os Leões (The Lions) |
| Founded: | 2018 |
| Dissolved: | 2023 |
| Ground: | Estádio Municipal de Machico, Machico, Madeira |
| Capacity: | 3,000 |
| Chairman: | Rui Fontes |
| Manager: | Marco Bragança |
| League: | Liga Revelação |
| Season: | 2022–23 |
| Position: | 7th |
| Website: | http://www.csmaritimo.org.pt/ |
| Pattern La1: | _maritimo2223h |
| Pattern B1: | _maritimo2223h |
| Pattern Ra1: | _maritimo2223h |
| Leftarm1: | FF0000 |
| Body1: | FF0000 |
| Rightarm1: | FF0000 |
| Shorts1: | FFFFFF |
| Socks1: | FF0000 |
| Pattern La2: | _maritimo2223a |
| Pattern B2: | _maritimo2223a |
| Pattern Ra2: | _maritimo2223a |
| Leftarm2: | 009150 |
| Body2: | 009150 |
| Rightarm2: | 009150 |
| Shorts2: | 009150 |
| Socks2: | 009150 |
| Pattern La3: | _maritimo2223t |
| Pattern B3: | _maritimo2223t |
| Pattern Ra3: | _maritimo2223t |
| Leftarm3: | FF0000 |
| Body3: | FF0000 |
| Rightarm3: | FF0000 |
| Shorts3: | FF0000 |
| Socks3: | FF0000 |
Club Sport Marítimo Under-23 is a former Portuguese football club that played in the Liga Revelação. They were the second reserve team of Club Sport Marítimo, however following the senior team's relegation from the Primeira Liga to the Liga Portugal 2 in 2023, the Under-23 team was dissolved for financial reasons.[1]