Calgarian
| Name | Calgarian |
| Type | Armed merchant cruiser |
| GRT | 12,515 tons (one of the largest ships hit) |
| Country |  British |
| Built | 1914 |
| Builder | Fairfield Ship Building and Engineering, Glasgow |
| Operator | Royal Navy |
| History | She was taken over on 15 September 1914 and became an armed merchant cruiser. Peace-time operator: Allan Line SS. Co., Ltd. (Canadian Pacific Ocean Services, Ltd.), Glasgow |
U-boat attacks on Armed merchant cruiser Calgarian
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 1 Mar 1918 | U 19 (Johannes Spieß) | Sunk | off Rathlin Island | 55.25N, 06.15W | 49 | ||
| Hit by three torpedoes while escorting a convoy in the North Channel. | ||||||||
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