Zircon
| Name | Zircon |
| Type | Fishing vessel (smack) |
| GRT | 48 tons |
| Country |  British |
| Built | 1908 |
| Builder | ?, Porthleven |
| Operator | Janies E. Long, Lowestoft |
| History | Fishing registration: LT 134 |
U-boat attacks on Fishing vessel (smack) Zircon
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 13 Feb 1917 | UC 65 (Otto Steinbrinck) | Sunk | Stopped and scuttled 26 miles SW of Smalls | 0 |
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