HAC may refer to:
- Hackney Downs railway station, London; National Rail station code HAC
- Le Havre Athletic Club a professional football club in France.
- Hectare
- High acid crude oil, a crude oil with a high concentration of naphthenic acids
- High-availability cluster (computing)
- Hokkaido Air System Co., Ltd.
- Honourable Artillery Company
- Hóquei Académico de Cambra, a rink hockey club from Vale de Cambra, Portugal
- Hospital Acquired Condition
- Hot Action Cop, a band from Nashville, TN
- Hot adult contemporary, a radio format
- Hughes Aircraft Company
- Human artificial chromosome
- Humanist Association of Canada
- Humboldt Arts Council - arts council in Humbolt County, California, USA
- Hyles-Anderson College
- Newey–West HAC estimator - heteroskedasticity- and autocorrelation-consistent estimator
- House Appropriations Committee, a committee of the United States House of Representatives
- The U.S. Hearing Aid Compatibility Act, 1988
- Heading Alignment Circle
- Hrvatske autoceste, a Croatian motorway operator
- Honorary Air Commodore, an honorary air force position
- Hotel Association of Canada
- Home Access Center
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