| Acronym | Definition |
|---|
| HCAS➣Hope College Arts and Sciences (St. Pompan Beach, FL) |
| HCAS➣Human Capital Advisory Services |
| HCAS➣Helsinki Collegium for Advanced Studies (University of Helsinki; Finland) |
| HCAS➣Howard County Autism Society (Columbia, MD) |
| HCAS➣Harford County Astronomical Society (est. 1970; Bel Air, MD) |
| HCAS➣Helicopter Close Air Support |
| HCAS➣Holy Child Auxilium School |