| Acronym | Definition |
|---|
| HSW | How Stuff Works (educational website) |
| HSW | How Stuff Works (information website) |
| HSW | Home Support Worker (healthcare; various organizations) |
| HSW | Human Service Worker (various locations) |
| HSW | Household Service Worker (various locations) |
| HSW | Health, Safety and Welfare (OSHA) |
| HSW | Health-Sector Wide (priority setting model) |
| HSW | Health Solutions Wales (IT, telecommunications and consultancy services to the NHS in Wales) |
| HSW | Had Sex With |
| HSW | Historical Society of Washington (District of Columbia) |
| HSW | Human Systems Wing (USAF) |
| HSW | Howard Scott Warshaw (game designer) |
| HSW | Hilton Sales Worldwide (hotels; various locations) |
| HSW | Heavy Steep Water |
| HSW | Home Service Worker |
| HSW | Holevo-Schumacher-Westmoreland (information theory) |
| HSW | Heat Sink Welding |
| HSW | Harvard-Stanford-Wharton (top business schools) |
| HSW | Half Sine Wave |
| HSW | Health and Safety Works Ltd (UK) |
| HSW | Helena Southwestern Railroad Company |
| HSW | Health and Safety at Work Act of 1974 |
| HSW | Hall Security Worker |
| HSW | Horizontal Sliding Wedge (artillery breechblock) |
| HSW | Hardware - Software - Wireless, Inc. |
| HSW | Horse Show for Windows (FunnWare Development software) |
| HSW | Happy Social Worker |