IAA : International Advertising Association 국제광고협회
IAEA : International Atomic Energy Agency 국제원자력기구
IATA : International Air Transport Association 국제항공운송협회
IBF : International Boxing Federation 국제복싱연맹
IBRD : International Bank for Reconstruction and Development 국제부흥개발은행
IC : Integrated Circuit 집적회로
ICAO : International Civil Aviation Organization 국제민간항공기구
ICBM : Inter Continental Ballistic Missile 대륙간탄도미사일
ICCA : International Council for Commercial Arbitration 국제상업중재위원회
ICM : International Congress of Mathematics 세계 수학자 대회
ICT : Information & Communication Technology 정보통신기술
IFA : Internationale Funk Ausstellung 국제가전박람회
ILO : International Labour Organisation 국제노동기구
IMF : International Monetary Funds 국제구제금융
IMO : International Maritime Organization 국제해사기구
IOC : International Olympic Commitee 국제올림픽위원회
IOU : I Owe You 약식차용증서
IPR : Intellectual Property Rights 지적재산권
IPU : International Parliamentary Union 국제의원연맹
IQ : Intelligence Quotient 지능지수
IR : Investor Relations 기업설명회
IRA : Irish Republican Army 아일랜드공화군
ISDN : Integrated Services Digital Network 통합디지탈망
IT : Information Technology 정보기술
ITA : International Technology Agreement 국제정보기술협정
ITC : International Trade Centre 국제무역센타
ITU : International Telecommunication Union 국제전기통신연합