Oostzee
| Name | Oostzee |
| Type | Tug |
| GRT | 199 tons |
| Country |  Dutch |
| Built | 1903 |
| Builder | Schpw. v. Jan Smit, Czn., Alblasserdam |
| Operator | NV L. Smit & Co’s Sleepdienst, Rotterdam |
| History |
U-boat attacks on Tug Oostzee
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 24 Jul 1917 | UB 18 (Ulrich Meier) | Sunk | Stopped and sunk 30 miles NW of Nieuwe waterweg | 51° 50'N, 3° 03'E | Rotterdam - Montevideo | ||
| w. crane MONTEVIDEO 488 in tow, sunk as well | ||||||||
Position of attack on Oostzee
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