IAA |
Instituto Antarctico Argentino |
IAAW |
International Air Ambulance Week 
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IAPC |
International Amateur Packet Club |
IAPMC |
International Association of Peace Messenger Cities 
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IARC |
Israel Amateur Radio Club 
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IARU |
International Amateur Radio Union 
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IARUMS |
International Amateur Radio Union Monitoring System |
IFFA |
Italian Flora Fauna Award |
IIA |
Italian Island Awards |
IIHG |
Indonesian Islands Hunter Group 
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ILERA |
International League of Esperantist Radio Amateurs |
ILLW |
International Lighthouse Lightship Weekend 
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IMD |
International Marconi Day |
IMW |
International Museum Weekend |
I.N.O.R.C. |
Italian Naval Old Rhythmers Club 
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IOCA |
Islands of Croatia Award |
IOMARS |
Isle of Man Amateur Radio Society |
IOSA |
Island of Scotland Award |
IOTA |
Islands on the Air 
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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 
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ITU |
International Telecommunication Union |
IYAS |
International Youth at Sea |
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