| I | Industry (Australia) | (Isbrytaren II) (Sweden) |
| (I Know) (GB) | (Ingeborg) (Germany) | Isefjord (Denmark) |
| Ideaal (Netherlands) | Ingham (USA) | Isla Ebusitana (Spain) |
| (Idlewild) (USA) | Ingo (Sweden) | (Islamount) (GB) |
| Illahee (USA) | Ingolf (Denmark) | Isle of Farquhar (Seychelles) |
| (Ilmari) (Finland) | Insulinde (Netherlands) | (Isvania) (Sweden) |
| (Imatra) (Finland) | International (USA) | Italia (Italy) |
| (Imatra II) (Finland) | Intrepid (USA) | Itata (Australia) |
| Immanuel (Germany) | (Ipopuliarchos Grigoropoulos) (USA) | (Itaxa III) (Norway) |
| Inaugural (USA)* | Irene (GB) | Iltis Class (Germany) |
| Inca (Peru)* | (Irithy) (Germany) | Ivanhoe (Canada) |
| Indiana (Egypt) | Ironsides (GB) | (Ivar Elias) (Norway) |
| Isaac H. Evans (USA) |
