Donegal
| Name | Donegal |
| Type | Passenger steamer |
| GRT | 1,885 tons |
| Country |  British |
| Built | 1904 |
| Builder | Caird & Co., Ltd., Greenock |
| Operator | Midland Railway Company, Belfast |
| History | Operating as an armed ambulance transport when sunk. |
U-boat attacks on Passenger steamer Donegal
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 17 Apr 1917 | UC 21 (Reinhold Saltzwedel) | Sunk | 19 miles S of the Dean LV | 50° 26'N, 1° 00'W | Havre - Southampton | 40 |
Position of attack on Donegal
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