Two classes and a one-ship class of submarine are known as the M class
- Soviet M-class submarine, a class of 148 Soviet Navy submarines built between 1933 and 1947
- British M-class submarine, a class of 3 Royal Navy submarine monitors built in 1917 and 1918
- USS M-1 (SS-47), a one-off United States submarine launched in 1915
See also
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This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.