HHC
- HHC Hardenberg
- Hague Hijacking Convention
- Hai Ha Confectionery
- Harlem Hospital Center
- Headquarters and headquarters company (United States)
- Hendricks Holding Company
- Hereditary hemochromatosis
- Hexahydrocannabinol
- Hill hold control
- Hilton Worldwide
- Hip Hop Congress
- Hip Hop Connection
- HipHopCanada
- Hispanic Health Council
- Hungarian Helsinki Committee
- New York City Health and Hospitals Corporation