HAC
- Acetic acid
- Calcium aluminate cements
- Gorani language
- Hachijojima Airport
- Hack (disambiguation)
- Hackney Downs railway station
- Hadassah Academic College
- Hague Academic Coalition
- Hague Adoption Convention
- Hakka Affairs Council
- Harrow Arts Centre
- Hectare
- High Ambition Coalition
- High-availability cluster
- Higher Attestation Commission
- Hokkaido Air System
- Homeland (supermarket)
- Honorary Air Commodore
- Honourable Artillery Company
- Hoosier Athletic Conference
- Horoya AC
- Hospital-acquired condition
- Hot Action Cop
- Hot adult contemporary
- House Appropriations Committee
- Hrvatske autoceste
- Hughes Aircraft Company
- Human artificial chromosome
- Humanist Association of Canada
- Humboldt Arts Council
- Hydra AC
- Hyles–Anderson College
- Hóquei Académico de Cambra
- Le Havre Athletic Club
- Lucile Hac
- Newey–West HAC estimator
- Nintendo Switch
- Sudan Humanitarian Aid Commission