Bittern
| Name | Bittern |
| Type | Steamer |
| GRT | 1,797 tons |
| Country |  British |
| Built | 1912 |
| Builder | Swan, Hunter & Wigham Richardson, Ltd., Newcastle |
| Operator | Cork Steamship Co., Ltd., Cork |
| History |
U-boat attacks on Steamer Bittern
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 20 Aug 1915 | U 38 (Max Valentiner) | Sunk | 50 miles NW of Ushant | 48° 53'N, 6° 18'W | Clyde - Livorno | coal & general cargo | 0 |
Position of attack on Bittern
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