| Acronym | Definition |
|---|
| OSW | Over Seas Worker (Philippines) |
| OSW | Office of the Status of Women (various locations) |
| OSW | Offshore Wind (renewable energy source) |
| OSW | Old School Wrestling |
| OSW | Office of Solid Waste |
| OSW | Orsk (Russia) |
| OSW | Operation Southern Watch (JTF-SWA) |
| OSW | Office of Surface Water (USGS) |
| OSW | On-Site Wastewater (various locations) |
| OSW | Off the Streets and Into Work |
| OSW | Official Scrabble Words |
| OSW | Oregon Stage Works (theater) |
| OSW | Old Swedish (linguistics) |
| OSW | Osijek Wireless (Croatia) |
| OSW | One Season Wonder |
| OSW | Office of Secretary of War (US DoD) |
| OSW | Operations Support Wing |
| OSW | Orient Script Worldwide (UK) |
| OSW | Outbound Signaling Word |
| OSW | Otaku Sailor Wars (game) |
| OSW | Open Surface Wound |
| OSW | Over-Size Waveguide |