15 attacks recorded (9 fatal)
| Date | Country | Region | Location | Fatal? | |
|---|---|---|---|---|---|
| Jan 11th 1921 | Philippines | Cavite Province, Luzon | N | ||
| Jul 1st 1921 | South Africa | KZN | Near the Post Office, Durban Harbor | Y | |
| Jul 1st 1921 | South Africa | KZN | Durban Harbor | Y | |
| Jul 1st 1921 | USA | Florida | Gadsden Point, Tampa Bay | N | |
| Aug 22nd 1921 | Haiti | Cape Haitien | Marine Dock | Y | |
| Aug 28th 1921 | Philippines | Luzon Island | Fort Frank, Manila Bay | Y | |
| Sep 1st 1921 | England | Dorset | Weymouth | N | |
| Oct 4th 1921 | Australia | Queensland | Barrier Reef | Y | |
| Oct 12th 1921 | Australia | Queensland | Off Hinchinbrook Island | N | |
| Nov 15th 1921 | Fiji | Rewa River | Y | ||
| Nov 27th 1921 | Australia | Queensland | Gay | N | |
| Nov 27th 1921 | Australia | Queensland | Gay | Y | |
| Dec 2nd 1921 | Fiji | Rewa River | Y | ||
| Dec 11th 1921 | Australia | Queensland | Fitzroy River at Rockhampton | N | |
| Dec 31st 1921 | Australia | Queensland | Great Barrier Reef | Y |