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- Mackensen: Mackensen class battlecruiser, launched 1917, not completed
- Magdeburg: Magdeburg class light cruiser, launched 1911
- Magdeburg: Braunschweig class (Type 130) corvette, building
- Main: Rhein class (Type 401) tender
- Main: Elbe class (Type 404) replenishment ship
- Mainz: 4,400 ton Kolberg class light cruiser, launched 1909
- Makrele: Barbe class (Type 520) utility landing craft, used as transport ships (decommissioned)
- Marburg: Lindau class (Type 320) minesweeper, commissioned 1959 to 1976, upgraded to Type 331
- Marburg: Fulda class (Type 331, upgraded Type 320 Lindau class) minesweepers, commissioned 1979 to 2000
- Marder: Jaguar (Type 140) fast attack craft, commissioned 1959—1972
- Marder: Tiger class (Type 148) fast attack craft, decommissioned
- Markgraf: 26,000 ton König class battleship, launched 1913
- Mars: Krebs class (Type 340) minesweeper, commissioned 1961—1992)
- Max Schultz: 2,230 ton Type 1934 destroyer
- Mecklenburg: 12,000 ton Wittelsbach class battleship, launched 1901
- Mecklenburg-Vorpommern: Brandenburg class (Type 123) frigate
- Medusa: 2,700 ton Gazelle class light cruiser
- Meersburg: Lüneburg class (Type 701) replenishment ship
- Michel HSK 9: 11,000 ton unique auxiliary merchant cruiser
- Minden: Lindau class (Type 320) minesweeper, commissioned 1960 to 1975, upgraded to Type 331
- Minden: Fulda class (Type 331, upgraded Type 320 Lindau class) minesweepers, commissioned 1978 to 1997
- Mira: Krebs class (Type 340) minesweeper, commissioned 1960—1973) is for sale click for details: – here
- Mölders: Lütjens class (Type 103B) destroyer, decommissioned
- Moltke: 23,000 ton Moltke class battlecruiser, launched 1910
- Mosel: Mosel class (Type 402) tender
- Mosel: Elbe class (Type 404) replenishment ship
- Mühlhausen: Type 742 diver support ship
- München: 3,300 ton Bremen class light cruiser, launched 1904
- Munin: Nasty class (Type 152) fast attack craft, commissioned 1960 to 1964
- Muräne: Barbe class (Type 520) utility landing craft, used as transport ships (decommissioned)
Read more about this topic: List Of Naval Ships Of Germany