IRI
- For Inspiration and Recognition of Science and Technology
- IRI (company)
- Iksan
- India Rejuvenation Initiative
- Industrial Research Institute
- Innovative Routines International
- Institut de Recherche et d'Innovation
- Institutet för rättsinformatik
- Intellectual Reserve
- International Reference Ionosphere
- International Registries
- International Republican Institute
- International Resistance Initiative
- International Roughness Index
- Internationalized Resource Identifier
- Interpersonal Reactivity Index
- Iran
- Iri-ye Olya
- Iri-ye Sofla
- Iringa Airport
- Irinotecan
- Islamic Reporting Initiative
- Istituto per la Ricostruzione Industriale
- Italian Rotors Industries
- The Earth Institute