Ootmarsum
| Name | Ootmarsum |
| Type | Steamer |
| GRT | 2,313 tons |
| Country |  Dutch |
| Built | 1900 |
| Builder | W. Gray & Co., Ltd., West Hartlepool |
| Operator | N.V. Stoomv. Mij. Oostzee (Vinke & Co.), Amsterdam |
| History |
U-boat attacks on Steamer Ootmarsum
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 17 Feb 1917 | UC 66 (Herbert Pustkuchen) | Sunk | 65 miles W of Ushant | 48.40N, 06.45W | Penarth - Las Palmas |
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