IIJ
| Acronym | Definition |
|---|---|
| IIJ | Internet Initiative Japan Inc. (Internet service provider) |
| IIJ | Indo-Iranian Journal |
| IIJ | Internet Initiative Japan |
| IIJ | International Institute for Journalism |
| IIJ | Is It Jazz (Boston band) |
| IIJ | Indian Institute of Jewellery (est. 2004; India) |
| IIJ | Industrial Ink Jet (printing technology) |