JI
| Acronym | Definition |
|---|---|
| JI | Joint Implementation |
| JI | Jemaah Islamiyah (Islamic fundamentalist group) |
| JI | Jamaat-e-Islami (Pakistani political party) |
| JI | Journal of Immunology |
| JI | Midway Airlines (FAA code) |
| JI | Johnston Island |
| JI | Job Instruction |
| JI | Joint Inspection |
| JI | Japan Insurance |
| JI | Junction Isolation |
| JI | Jet Interaction |
| JI | Joint Index |
| JI | Jurong Institute (Singapore) |
| JI | Junior Initiate |
| JI | Jejune Institute (San Francisco, CA) |