| Acronym | Definition |
|---|
| HACA➣Human Anti-Chimeric Antibody (medicine) |
| HACA➣Historical Armed Combat Association (now known as ARMA) |
| HACA➣Hypothermia After Cardiac Arrest |
| HACA➣human anti-chimeric antibodies |
| HACA➣Haute Autorité de la Communication Audiovisuelle |
| HACA➣Henderson Allied Community Advocates (Nevada) |
| HACA➣Housing Authority of the City of Austin (Texas) |
| HACA➣Homestead and Agricultural Credit |
| HACA➣Homestead and Agricultural Credit Aid (Minnesota) |
| HACA➣Housing Authority of the City of Annapolis (Maryland) |
| HACA➣Hellenic Association of Communications Agencies (Greece) |
| HACA➣Housing Authority of the City of Asheville (North Carolina) |
| HACA➣Housing Authority of the County of Alameda (California) |
| HACA➣Hydrogen-Abstraction/Carbon-Addition |
| HACA➣Hemophilia Association of the Capital Area |
| HACA➣Houston Air Cargo Association (Texas) |
| HACA➣6-Hydroxy-2-Aminocaproic Acid |
| HACA➣Housing and Community Affairs (Texas) |
| HACA➣Hawaiian Acres Community Association |
| HACA➣Hyderabad Agricultural Co-Operative Association Ltd |
| HACA➣Hmong American Community Association |
| HACA➣Housing Authority of the City of Atlanta (Georgia) |
| HACA➣Haitian American Community Association (Chicago, IL) |
| HACA➣Hungarian American Cultural Association |
| HACA➣Hamilton and Area Curling Association |
| HACA➣Houston Area Council of ABWA |
| HACA➣Headford and Corrib Anglers Association (Ireland) |
| HACA➣Highway Advertising Control Act of 1971 |
| HACA➣Highbury Area Community Association |
| HACA➣Hoosick Area Church Association (New York) |
| HACA➣Holocaust Assets Commission Act of 1998 |
| HACA➣Hawthorne Airport Community Association (California) |
| HACA➣H-bonding Acceptor Changed Area |
| HACA➣Humboldt Academy for Career Advancement |
| HACA➣Houston Area Carriage Association |
| HACA➣Humanitarian Aid Corridor Act of 1996 |
| HACA➣Hydrogen Acceptor Charged surface Area |
| HACA➣Homebuilders Association of Central Arizona |
| HACA➣Hearing Aid Compatibility Act of 1988 |
| HACA➣Hammered Aluminum Collectors Association |
| HACA➣Hampton Area Clergy Association (New Hampshire) |
| HACA➣H-Abstraction Acetylene Addition (chemistry) |