M class or M-class may refer to:
Military
- M-class cruiser, a planned German light cruiser class
- M-class destroyer, several classes of destroyer
- Admiralty M-class destroyer, a class of British destroyers built 1913–1916 and served in World War I
- M-class, British destroyers starting with the letter M of the L and M-class destroyer, launched 1939–1942 and served in World War II
- Marcílio Dias-class destroyer, Brazilian destroyers built during World War II
- Karel Doorman-class frigate, of the Royal Netherlands Navy
- M-class minesweeper, several classes of minesweeper
- M-class minesweeper (Germany), a class of minesweepers of the World War II German Kriegsmarine
- M-class minesweeper (Netherlands), a class of minesweepers of the Royal Netherlands Navy built after World War I
- Abercrombie-class monitor, a British WWI class of monitor gunships
- M-class submarine, several classes of submarine
Transportation
- Mercedes-Benz M-Class, an automobile
- M-segment, a European vehicle size class
- NZR M class locomotives
- Pennsylvania Railroad class M1, locomotives
- Victorian Railways M class, steam locomotives
- Victorian Railways M class (diesel-hydraulic), shunting locomotives
- OOCL M-class container ship, a class of large container ships operated by Orient Overseas Container Line
- Maersk M-class container ship, a class of large container ships operated by Maersk Line
Astronomy
- M class, a stellar classification
- M class, a class of solar flare
See also
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