| Innate Releasing Mechanism | Academic & Science |
| Institutional Records Management | Academic & Science |
| Iron Mountain, Inc., of Pennsylvania | Business |
| Integrated Resources Management | Business |
| Investor Relationship Management | Business |
| Image Reject Mark | Business |
| Iron Mountain Mining, LTD. | Business |
| Intelligent Rainwater Management | Business |
| Integrated Resource Management | Business |
| Innovative Resource Management | Business |
| Insurance Risk Management | Business |
| Incentivized Resource Management | Business |
| Identity Relationship Management | Business |
| Interactive Rights Management | Business |
| Information Risk Management | Business |
| Investor Relations Managers | Business |
| Integrated Rootzone Management | Business |
| Interference Reflection Microscopy | Chemistry |
| Instructional Recreation Module | Community |
| Institute of Risk Management | Community |
| Iskcon Revival Movement | Community |
| Icetratt Rights Management | Community |
| International Roaming MIN | Computer and Networking |
| Infrared Monitor | Computer Hardware |
| Information Resources Management | Computing |
| Inherited Rights Mask | Computing |
| Internet Resource Management | Computing |
| Internet Relationship Management | Computing |
| Intelligent Resource and Mapping | Computing |
| Information Resource Management | Computing |
| Information Rights Management | Computing |
| Inventory and Related Materials | Computing |
| Intelligent Repeater Module | Computing |
| Intel Remote Management | Computing |
| Isothermal Remanent Magnetization | Earth Science |
| Intermediate Restorative Material | Electronics |
| Isothermal Remnant Magnetization | Electronics |
| Ion Rate Monitoring | Electronics |
| Insect Resistance Management | General |
| Installation Requirements Model | General |
| Internal Revenue Manual | General |
| I Repetition max | General |
| implementation Reference Methodology | General |
| Individual Retirement Multiplier | General |
| Installed Reserve Margin | General |
| Independent Reporting Mechanism | General |
| Innovative Rotational Molding | General |
| IntelliSnap recovery manager | General |
| Immediate Response Mechanism | General |
| Interim Remedial Measures | General |
| Immediately Reportable Matter | General |
| Identify Recognize and Manage | General |
| Internal Revenue Manuals | General |
| Inside Rearview Mirror | General |
| Department of Commerce -- Information Resource Management Division | Governmental |
| Institute for Regenerative Medicine | Governmental |
| Institute for Rock Magnetism | Governmental |
| Institute of Reactor Materials | Governmental |
| International Raw Materials | International |
| Internal Redirection Mapping | Internet |
| Internet Radio Magazine | Internet |
| International Relations Manager | Jobs |
| Integrated Resource Manager | Jobs |
| Information Resource Manager | Military and Defence |
| Interim Restorative Material | Military and Defence |
| Integrated Risk Management | Military and Defence |
| Indiana Railway Museum | Regional |
| Irish Republican Movement | Regional |
