| Madeira Island Submarine Base | |
| Ensign: | Brasao ComForS.png |
| Ensign Size: | 50px |
| Native Name: | Portuguese: Base de Submarinos da Ilha da Madeira|italic=yes |
| Country: | Brazil |
| Type: | Navy base |
| Coordinates: | -22.8519°N -43.775°W |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Location in Brazil |
| Pushpin Label: | BSIM |
| Controlledby: | Brazilian Navy |
| Open To Public: | No |
| Current Commander: | Cap. Fernando De Luca Marques de Oliveira |
| Occupants: |
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Madeira Island Submarine Base, commonly shortned BSIM is a submarine base of the Brazilian Navy, located in Itaguaí, Brazil.
The BSIM was conceived by the Ministry of Defence in the early 2010s, in order to receive and continue the construction of the new submarines of the Navy by the Brazilian company Itaguaí Construções Navais (ICN), the base was also projected to be headquarters of the company.[1]
The base was inaugurated in 2020.[2] The first Brazilian Scorpène class submarine (S40), was launched on 14 December 2018.[3] The (S41) was launched on 11 December 2020.[4] The construction of the submarines Tonelero (S42) and Angostura (S43) started in 2017 and 2018 respectively.[5] Since 2018, the base is home to the construction of the Brazilian nuclear submarine fleet, starting with the Álvaro Alberto.[6]
On 12 July 2021, the Navy transferred the Brazilian Submarine Force Command (ComForS) to the base.[7]