| IARC | Illinois Accelerator Research Center 
| Others |
| IARC | Immigration Advice and Rights Centre
| Others |
| IARC | Indian Arts Research Center
| Others |
| IARC | Indiana Agriculture Resource Council
| Others |
| IARC | Indiana Association of Regional Councils
| Others |
| IARC | Individual Aircraft Record Card
| Others |
| IARC | Inter American Regional Committee
| Others |
| IARC | International Accreditation and Recognition Council
| Others |
| IARC | International Aerial Robotics Competition
| Others |
| IARC | International Age Rating Coalition
| Others |
| IARC | International Agency for Research in Cancer
| Others |
| IARC | International Agency for Research on Cancer
| Others |
| IARC | International Agency for Research on Cancer (WHO)
| Others |
| IARC | International Agricultural Research Center
| Others |
| IARC | International Arctic Research Center
| Others |
| IARC | International Assisted Reproduction Center
| Others |
| IARC | International Association of Reality Communication
| Others |
| IARC | International Automobile Recycling Congress
| Others |
| IARC | International Automotive Research Centre
| Others |
| IARC | Israel Amateur Radio Club
| Others |