HRI
- Harish-Chandra Research Institute
- Harte Research Institute for Gulf of Mexico Studies
- Hawaii Reserves
- Heart Research Institute
- Heffter Research Institute
- Heme-regulated inhibitor kinase
- Herald Investment Trust
- Hermiston Municipal Airport
- Horse Racing Ireland
- Horticulture Research International
- Hotel, Restaurant and Institutional Management
- Hri (Buddhism)
- Huddersfield Royal Infirmary
- Hull Royal Infirmary
- Human Readable Interpretation
- Human Rights Initiative of North Texas
- Human Rights Internet
- Human robot interaction
- Humanitarian Response Index
- Mattala Rajapaksa International Airport