Ibo
| Name | Ibo |
| Type | Gunboat |
| GRT | 397 tons |
| Country |  Portuguese |
| Built | 1911 |
| Builder | Lisbon naval dockyard |
| Operator | Portugese Navy |
| History |
U-boat attacks on Gunboat Ibo
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 29 Aug 1916 | U 20 (Walther Schwieger) | Damaged | Damaged by gunfire off the Tagus river |
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