| IAA |
Instituto Antarctico Argentino |
| IAAW |
International Air Ambulance Week 
|
| IAPC |
International Amateur Packet Club |
| IAPMC |
International Association of Peace Messenger Cities
|
| IARC |
Israel Amateur Radio Club
|
| IARU |
International Amateur Radio Union
|
| IARUMS |
International Amateur Radio Union Monitoring System |
| IFFA |
Italian Flora Fauna Award |
| IIA |
Italian Island Awards |
| IIHG |
Indonesian Islands Hunter Group
|
| ILERA |
International League of Esperantist Radio Amateurs |
| ILLW |
International Lighthouse Lightship Weekend
|
| IMD |
International Marconi Day |
| IMW |
International Museum Weekend |
| I.N.O.R.C. |
Italian Naval Old Rhythmers Club
|
| IOCA |
Islands of Croatia Award |
| IOMARS |
Isle of Man Amateur Radio Society |
| IOSA |
Island of Scotland Award |
| IOTA |
Islands on the Air
|
| IPA |
International Police Association |
| IPARC |
International Police Association Radio Club |
| IPHA |
Information Programme for Handicapped Radio Amateurs |
| IREF |
Island Radio Expedition Foundation |
| IRTS |
Irish Radio Transmitters Society |
| ISS |
International Space Station |
| I.S.W.L. |
International Short Wave League
|
| ITU |
International Telecommunication Union |
| IYAS |
International Youth at Sea |
|
|
|
|
