Waldemar
| Name | Waldemar |
| Type | Steamer |
| GRT | 1,267 tons |
| Country |  Norwegian |
| Built | 1904 |
| Builder | Fredriksstad Mek. Verks., Fredrikstad |
| Operator | A/S Fredriksstad Dampsk. (A. Hannested), Fredrikstad |
| History |
U-boat attacks on Steamer Waldemar
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 28 May 1917 | UC 21 (Reinhold Saltzwedel) | Sunk | 2.5 miles off Cabo Moras | 43.47N, 07.28W | Pomaron - Dublin | copper ore | 0 |
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