Countess Of Mar
| Name | Countess Of Mar |
| Type | Steamer |
| GRT | 2,234 tons |
| Country |  British |
| Built | 1916 |
| Builder | Forth SB. & Engineering Co., Ltd., Alloa |
| Operator | Gascony SS. Co., Ltd. (L. Walford (London), Ltd.), London |
| History |
U-boat attacks on Steamer Countess Of Mar
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 4 Aug 1917 | U 61 (Victor Dieckmann) | Sunk | 55 miles N1/4E of Bayonne | 44.27N, 01.48W | Bilbao - Cardiff | ore | 20 |
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