12 attacks recorded (6 fatal)
| Date | Country | Region | Location | Fatal? | |
|---|---|---|---|---|---|
| May 5th 1917 | Kuwait | N | |||
| May 31st 1917 | Philippines | Luzon Island | Canacao Bay | Y | |
| Jun 3rd 1917 | USA | South Carolina | Calibogue Sound | N | |
| Jul 1st 1917 | Fiji | Moala Island | Y | ||
| Jul 1st 1917 | Libya | Tripoli | N | ||
| Jul 15th 1917 | Atlantic Ocean | Off IRELAND | 82 miles from Fastnet | Y | |
| Jul 18th 1917 | USA | Florida | Florida Keys | Y | |
| Sep 1st 1917 | Panama | Colon | Y | ||
| Sep 9th 1917 | USA | Hawaii | Nanakuli, Oah | N | |
| Sep 21st 1917 | USA | New Jersey | Sea Bright, Monmouth County | N | |
| Nov 1st 1917 | Mozambique | Off Inhaca Island | Y | ||
| Dec 15th 1917 | Australia | Western Australia | Port Hedland | N |