Waltham
| Name | Waltham |
| Type | Navy Trawler |
| GRT | 162 tons |
| Country |  British |
| Built | 1897 |
| Builder | Mackie & Thomson, Glasgow |
| Operator | Royal Navy |
| History | Peace-time operator: Consolidated Steam Fishing & Ice Co. |
U-boat attacks on Navy Trawler Waltham
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 10 Oct 1917 | Sunk | Missing off Isle of Man. Waltham may have been lost on mines laid six days earlier by UC 75. | 12 |
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