Idi
- ICT Development Index
- Idi Amin
- Idi Othman Guda
- Idi Papez
- Idi b. Abin Naggara
- Idi language
- Inclusive Development Index
- Indian Diamond Institute
- Indiana County–Jimmy Stewart Airport
- Industrial Developments International
- Infectious Diseases Institute
- Institut de Droit International
- Interactive Design Institute
- International Diving Institute
- Israel Democracy Institute
- Israel Diamond Institute
- Iði