| Name | Build year | Nationality | Bilde | Loss during WW2 |
|---|---|---|---|---|
| M/K Sandvikhorn (M181HØ) | 1917 | Norway | 1944-1-? | |
| M/K Sandøy I (DSTO) | 1939 | Norway | Attacked from air, 1942-12-11 | |
| D/S Santa | 1936 | Great Britain | ||
| D/S Sarka | 1936 | Great Britain | ||
| D/S Sarna | 1930 | Great Britain | Sunk by mine, 1941-2-25 | |
| D/S Satsa | 1936 | Great Britain | ||
| M/S Saturnia | 1927 | USA | ||
| D/S Seksern | 1930 | Norway | ||
| D/S Semla | 1924 | Great Britain | ||
| Oppsynsskip Senja | 1937 | Norway | ||
| D/S-flytende kokeri Sevilla | 1900 | Great Britain | ||
| D/S Sevra | 1929 | Great Britain | Sunk by mine, 1940-11-6 | |
| D/S Shera | 1929 | Great Britain | Ran aground, 1942-3-9 | |
| D/S Shika | 1929 | Great Britain | ||
| D/S Shusa | 1929 | Great Britain | ||
| D/S Sidney Smith | 1929 | South Africa | ||
| D/S Sigfra | 1937 | Great Britain | ||
| M/B Siglaos (M 149 H) | 1936 | Norway | ||
| Torpedobåt Sild | 1900 | Norway | ||
| Minesveiper Silhouette (Norsk marine, 1943) | 1926 | Norway | ||
| D/S Silva | 1924 | Great Britain | ||
| M/S Silvaplana | 1938 | Norway | Hijacked, 1941-9-10 | |
| D/S Simbra | 1937 | Great Britain | ||
| TSS Sir John Hawkins | 1929 | Great Britain | ||
| D/S Sirra | 1929 | Great Britain |