| Name | Build year | Nationality | Bilde | Loss during WW2 |
|---|---|---|---|---|
| D/S Marion Moller | 1909 | Great Britain | ||
| D/S Marquesa | 1918 | Great Britain | ||
| D/S Marslew | 1926 | Great Britain | Torpedoed, 1941-2-23 | |
| D/S Mary Moller | 1902 | Great Britain | ||
| T/S Mataroa | 1922 | Great Britain | ||
| T/S Mauretania | 1938 | Great Britain | ||
| D/T Melpomene | 1923 | Great Britain | Torpedoed, 1942-3-5 | |
| D/S Merkland | 1934 | Great Britain | ||
| D/S Meroë | 1928 | Great Britain | ||
| M/S Minna | 1939 | Great Britain | ||
| D/S Miraflores | 1921 | Great Britain | Torpedoed, 1942-2-19 | |
| D/S Miriam | 1912 | Great Britain | Ran aground, 1944-2-2 | |
| HMS MMS 1021 | 1943 | Great Britain | ||
| M/S MMS 206 Mirless | 1942 | Great Britain | ||
| T/S Montclare | 1922 | Great Britain | ||
| D/S Mooltan | 1923 | Great Britain | ||
| D/S Morinda | 1913 | Great Britain | ||
| D/S Munlock | 1917 | Great Britain | ||
| D/S Myriel | 1913 | Great Britain | ||
| D/S Nailsea Lass | 1917 | Great Britain | Torpedoed, 1941-2-24 | |
| D/S Narkunda | 1920 | Great Britain | Attacked from air, 1942-11-14 | |
| D/S Narva | 1937 | Great Britain | Fire/Explosion, 1945-1-15 | |
| D/S Nascopie | 1912 | Great Britain | ||
| M/T Nassa | 1942 | Great Britain | ||
| T/S Nebraska | 1920 | Great Britain | Torpedoed, 1944-4-8 |