IAEA
International Atomic Energy Agency

IALA
International Auxiliary Language Association

IAU
International Association of Universities

IAVE
International Association for Volunteer Effort

ICAO
International Civil Aviation Organization

ICCF
International Correspondence Chess Federation

ICEF
International Children's Emergency Fund

ICL
International Computers Limited

ICOM
International Council On Museums

IDA
International Development Association

IDF
International Duty Free

IEA
International Energy Agency

IFC
International Finance Corporation

ILO
International Labour Organization

IMEI
International Mobile Equipment Identity

Intelsat
International Telecommunication Satellite Organization

international
international code of signals

International
the Socialist International

Interpol
International Criminal Police Organization

IOGT
International Organization of Good Templars

IPA
International Phonetic Association

IPC
International Paralympic Committee

IPPF
International Planned Parenthood Federation

ISBD
International Standard Bibliographic Description

ISS
International Student Service

ITO
International Trade Organization

IVR
international vehicle registration

IWLA
 International Wine Law Association

JCI
Joint Commission International

RIIA
Royal Institute of International Affairs