| Abbreviation | Definition |
|---|---|
| IST | Inddiethumpers Standard Time |
| ISTEA | Intermodal Surface Transportation Efficiency Act of 1991 (Public Law 102-240 |
| ITAP | Interscholastic Trial Advocacy Program |
| ITF | Inmate Trust Fund |
| ITH | In The Head |
| ITMRA | Information Technology Management Reform Act (became the Clinger-Cohen Act) |
| ITO | In Terms Of |
| ITOC | International Terrorism and Organized Crime |
| ITS | Information Technical Services (Department of Commerce) |
| ITS | Internal Transcribed Spacer |
| IU | Inebriated and Underage |
| IUCIA | Illinois Uniform Conviction Information Act |
| IUU | Illegal Unreported And Unregulated |
| IVIS | Internet Victim Information System |
| IWB | Inside WaistBand holster |
| IWKYA | I Will Kick Your Ass |
| IWQ | Individual Weapons Qualification |
| J | Judge |
| J | Judge, justice |
| J | Judgement |