| Abbreviation | Definition |
|---|---|
| ISTEA | Intermodal Surface Transportation Efficiency Act of 1991 (Public Law 102-240 |
| ISU | Investigation And Surveillance Units |
| ITAF | International Tactical Assault Force |
| ITAP | Interscholastic Trial Advocacy Program |
| ITCU | Integrated Technological Crime Unit |
| ITEC | Interagency Trade Enforcement Center |
| ITF | Inmate Trust Fund |
| ITH | In The Head |
| ITLL | Innovation and Technology Law Lab |
| ITLN | International Travel Law Network |
| ITLO | Indian Trust Litigation Office |
| ITMRA | Information Technology Management Reform Act (became the Clinger-Cohen Act) |
| ITO | In Terms Of |
| ITOC | International Terrorism and Organized Crime |
| ITPG | Innocent (un)'Til Proven Guilty. |
| ITS | Information Technical Services |
| ITS | Internal Transcribed Spacer |
| ITSL | Information Technology Society and Law |
| IU | Inebriated and Underage |
| IUCIA | Illinois Uniform Conviction Information Act |