| IROC | I Race Off Course 
| Others |
| IROC | I Race Other Cars
| Others |
| IROC | I Ran Over Craig
| Others |
| IROC | I Reek Of Cologne
| Others |
| IROC | I Run Off Cliffs
| Others |
| IROC | I Run Off Course
| Others |
| IROC | I Run Over Children
| Others |
| IROC | I Run Over Critters
| Others |
| IROC | I'm Really On Crack
| Others |
| IROC | I'm Really Only a Camaro
| Others |
| IROC | Idiot Right Out of College
| Others |
| IROC | Idiots Rely On Chevrolets
| Others |
| IROC | Ignorant Retard Out Cruising
| Others |
| IROC | Imaging and Radiation Oncology Core
| Others |
| IROC | Improving Renal Outcomes Collaborative
| Others |
| IROC | In Rememberance Of Christ
| Others |
| IROC | Increase Reliability on Combat
| Others |
| IROC | Increased Reliability on Combat
| Others |
| IROC | Increases Reliability on Combat
| Others |
| IROC | Increases Reliability on CoMDat
| Others |
| IROC | Independent Rates Oversight Committee
| Others |
| IROC | Independent Rental Owners Committee
| Others |
| IROC | Independent Rental Owners Council
| Others |
| IROC | Institution Race Of Champions
| Others |
| IROC | Integrated Radio and Optical Communication
| Others |
| IROC | Integrated RF and Optical Communications
| Others |
| IROC | Integrated Robustness On a Chip
| Others |
| IROC | Integrated Robustness On Chip
| Others |
| IROC | Intelligence Readiness and Operations Capability
| Others |
| IROC | Interagency Resource Ordering Capability
| Others |
| IROC | Interleague Racing Online Competition
| Others |
| IROC | International Race Of Champions
| Others |
| IROC | International Race of the Champions
| Others |
| IROC | International Racing of Champions
| Others |
| IROC | Internet Ranchero Club
| Others |
| IROC | Intuitive Robotic Operator Control
| Others |
| IROC | Irish Redneck Out Cruising
| Others |
| IROC | Iron Removal Odor Control
| Others |
| IROC | It's Really Only Chevrolet
| Others |
| IROC | Italian Resting On Console
| Others |
| IROC | Italian Retards Out Cruising
| Others |
| IROC | Italian Roney Out Cruisin
| Others |
| IROC | Itatilan Retard Out Cruising
| Others |