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- Maagen (Denmark): 110-ton fishery patrol vessel
- Makrelen (Denmark): 108-ton torpedo boat
- Maranho (Brazil): 934-ton destroyer
- Mardus (Estonia): 80-ton gunboat
- Mariscal Sucre (Colombia): 125-ton gunboat
- Mato Grosso (Brazil): 560-ton destroyer
- Mazur (Poland) 340-ton torpedo boat
- Mewa (Poland): 183-ton minesweeper
- Miina (Finland): 80-ton mine tender
- Ming Chuen (China): 465-ton gunboat
- Ming Sen (China): 465-ton gunboat, captured by Japan
- Moa (New Zealand): 607-ton Bird class minesweeper
- MTB 102 (UK) 68-foot Motor Torpedo Boat
- MTB 345 (UK, then Norway) 16.05-ton Motor Torpedo Boat
- Murature (Argentina): 900-ton gunboat
Read more about this topic: List Of World War II Ships Of Less Than 1000 Tons