HSAO
| Acronym | Definition |
|---|---|
| HSAO | Hoger Sociaal Agogisch Onderwijs (Dutch: Higher Socio-Agogic Education) |
| HSAO | Health and Safety Awareness Officer (UK) |
| HSAO | Hunter Sailing Association of Oregon |
| HSAO | Harvard Society for the Advancement of Orthodontics |
| HSAO | Houston South Area Office (Houston, TX) |