| Acronym | Definition |
|---|
| HSO➣Hiroshima Symphony Orchestra (Japan) |
| HSO➣HIPAA (Health Insurance Portability and Accountability Act) Security Officer |
| HSO➣Halion Symphonic Orchestra |
| HSO➣Thermal Enhanced Small Outline Package |
| HSO➣Hartford Symphony Orchestra |
| HSO➣Health and Safety Officer |
| HSO➣Huntsville Symphony Orchestra |
| HSO➣Health Sciences Online |
| HSO➣Homeostatic Soil Organism |
| HSO➣Health Service Organizations |
| HSO➣Housing Support Officer (various organizations) |
| HSO➣Health Service Ombudsman (UK) |
| HSO➣Hereford String Orchestra (est. 1958; UK) |
| HSO➣Haitian Student Organization (various universities) |
| HSO➣Honor Super Omnia (Kappa Delta Rho fraternity) |
| HSO➣Human Service Organization |
| HSO➣Human Services Officer |
| HSO➣Hershey Symphony Orchestra (Hershey, PA) |
| HSO➣Hot Sports Opinion |
| HSO➣High-Speed Online (Time Warner Cable) |
| HSO➣Healthcare Support Office (United States Navy) |
| HSO➣Hot Spot Operator (wireless access) |
| HSO➣Habitation and Station Operations |
| HSO➣Hull Street Outlet (Richmond, VA) |
| HSO➣Horizontal Sight Offset (traffic engineering) |