| XII Squadriglia MAS | |
|---|---|
 The Italian torpedo boat MAS 528 on Lake Ladoga in the Summer 1942, during the Siege of Leningrad | |
| Active | May 1942–October 1942 |
| Country |  Italy |
| Branch | Regia Marina |
| Type | MAS flotilla |
| Role | Anti-submarine warfare Commerce raiding Direct fire Fire support Maritime patrol Raiding Underwater warfare |
| Size | Squadron |
| Garrison/HQ | Sortanlahti |
| Equipment | MAS boats |
| Engagements | Siege of Leningrad |
| Commanders | |
| Notable commanders | Giuseppe Bianchini |
The XIIª Squadriglia Squadriglia MAS (Mezzi d'Assalto) (Italian for "12th Assault Vessel Squadron") was a formation of the Italian Royal Navy (Regia Marina) which served on Lake Ladoga as part of the Axis siege of Leningrad during World War II.
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