| Acronym | Definition |
|---|
| BTU | British Thermal Unit |
| BTU | Brandenburgische Technische Universität |
| BTU | Back to University (various organizations) |
| BTU | Biomass to Energy |
| BTU | Bintulu, Sarawak, Malaysia - Bintulu (Airport Code) |
| BTU | Back To You |
| BTU | Boston Teachers Union |
| BTU | Biztalk Utilities |
| BTU | Bluetooth Test Unit |
| BTU | Bursa Technical University (Turkey) |
| BTU | Broward Teachers Union (Florida) |
| BTU | Better They Understand |
| BTU | Baptist Training Union |
| BTU | Basic Transmission Unit |
| BTU | Baltimore Teachers Union |
| BTU | Beach Termination Unit (US DoD) |
| BTU | Business Travel Unit |
| BTU | Bus Terminal Unit |
| BTU | Basic Terminal Unit |
| BTU | Blame the User |