| Acronym | Definition |
|---|
| BTW | By The Way |
| BTW | Between |
| BTW | By the Way (Red Hot Chili Peppers album) |
| BTW | Below the Water |
| BTW | Between The Words |
| BTW | Before the War |
| BTW | Books That Work |
| BTW | Beyond the Wall |
| BTW | Behind the Wheel |
| BTW | Back To Work (shorthand used in email) |
| BTW | Build the Wall |
| BTW | Born This Way |
| BTW | Bridge the World |
| BTW | Born to Win |
| BTW | Be That Way (less common) |
| BTW | Balls to the Wall |
| BTW | Bring the Wine |
| BTW | Below the Waist |
| BTW | Booker T. Washington (various locations) |
| BTW | Best to Worst (ranking) |
| BTW | Back to Wall (toilet style) |
| BTW | Bridging the Watershed (educational outreach program) |
| BTW | Big Time Wrestling (various locations) |
| BTW | Belasting op Toegevoegde Waarde (Dutch: Tax On Added Value) |
| BTW | Better Than Wolves (gaming) |
| BTW | Bearing to Waypoint |
| BTW | Breast Test Wales (Welsh breast cancer screening program) |
| BTW | Bt Wholesale |
| BTW | Bluetooth for Windows |
| BTW | Black Theatre Workshop (Canada) |
| BTW | Board Test Workshop |
| BTW | Beyond These Walls |
| BTW | Between the Wars |
| BTW | Bring the Wheelchair (text slang) |
| BTW | Bak-Tang-Wiesenfeld Sandpile (physics) |
| BTW | Bundesverband der Deutschen Tourismuswirtschaft |
| BTW | Boat Wave |
| BTW | Belasting Toegevoegde Waarde (Dutch: value added tax) |
| BTW | Business Travel World (trade magazine; UK) |
| BTW | Brothers of the Third Wheel (trikers organization) |
| BTW | British Telecom Wholesale (UK) |
| BTW | BioTech World |
| BTW | British Traditional Wicca |
| BTW | Butuanon (SIL code, Philippines) |
| BTW | Business and Technical Writing |
| BTW | British Traditional Witchcraft |
| BTW | Bike This Way |
| BTW | Breaching the Web |
| BTW | Blood Thirsty Warriors (gaming clan) |
| BTW | Band-To-Wavelength |
| BTW | Buried Transuranic Waste |
| BTW | Barbarian: Total War (game mod) |
| BTW | Burlington Trailways Charters and Tours |
| BTW | Beyond Tears Worldwide (Christian humanitarian and development organization) |
| BTW | Border Terrier Welfare (UK registered charity) |
| BTW | Bite the Waffle |