NHI may refer to:
- National Health Index (NHI) Number, a unique identifier used in the New Zealand health system
- National Health Insurance 国民健康保険 (Kokumin-Kenkō-Hoken?), a form of government health insurance in Japan.
- National Hispanic Institute, a think-tank focused on the leadership development of young Latinos
- National Historical Institute, in the Philippines
- Nederlandse Helikopter Industrie (NHI), a Dutch manufacturer of helicopters
- New Horizon Interactive (NHI), a video games company, which has developed the popular Club Penguin MMOG
- NHIndustries, a manufacturer of helicopters