| Institutional Assessment and Research | Academic & Science |
| Institute for Agricultural Research | Academic & Science |
| Yaroslavl | Airport Code |
| Industry Aeronautical Romania | Business |
| Industria Aeronautic Romana | Business |
| Investment Authorization Request | Business |
| Investment Approval Request | Business |
| Indiana Association of REALTORS | Business |
| Illinois Association of REALTORS | Business |
| Investment Adviser Requirements | Business |
| Iowa Association of REALTORS | Business |
| Industrial All Risk | Business |
| Investment Adviser Representative | Business |
| Investment Advisory Representative | Business |
| Investment Advisor Representative | Business |
| Islamic Association of Raleigh | Community |
| Internet Address Registry | Computing |
| Instruction Address Register | Computing |
| Initial Address Reject | Computing |
| Inappropriate Action Required | Computing |
| In A Relationship | General |
| Information Analysis and Retrieval | General |
| Ignore All Rules | General |
| International Affairs Review | General |
| Interactive Agent Reporting | General |
| Idaho Appellate Rules | General |
| International Animal Rescue's | General |
| Induced Acrosome Reaction | General |
| Infantry Automatic Rifle | General |
| Independent Animal Rescue | General |
| International Audio Review | General |
| Infantry Automati Rifle | General |
| Industria Aeronautica Romana | General |
| Animal Rescue | General |
| Interim Assistance Reimbursement | General |
| Impaired Acrosomal Reaction | General |
| Inventory Adjustment Report | General |
| Illinois Assessment of Readiness | General |
| Intra Action Review | General |
| Inventory Activity Report | General |
| Intelligent Air Restrictor | General |
| Instantaneous Axis of Rotation | General |
| In A Round | General |
| Integral Alternator Regulator | General |
| Iowa Auto Recyclers | General |
| Institute for Autism Research | Governmental |
| Infantry Assault Rifle | Governmental |
| Institute for Aerospace Research | Governmental |
| Institute of Audio Research | Governmental |
| Installation Allowances Report | Governmental |
| Internet Assisted Review | Internet |
| International Animal Rescue | Medical |
| I Am Replying | Messaging |
| Interoperability Assessment Report | Military and Defence |
| Yaroslavl, Russia | Regional |