| Acronym | Definition |
|---|
| BTK | Bölcsészettudományi Kar (Hungary) |
| BTK | Bratsk (Russia) |
| BTK | Berliner Technische Kunsthochschule (German: Berlin Technical Arts High School) |
| BTK | Bind Torture Kill (serial killer's nickname for himself) |
| BTK | Bruton's Tyrosine Kinase |
| BTK | Billy the Kid |
| BTK | Bacillus Thuringiensis var. Kurstaki |
| BTK | Bruton Agammaglobulinemia Tyrosine Kinase |
| BTK | Born to Kill |
| BTK | Below the Knee |
| BTK | Banque Tuniso-Koweitienne (French: Tunisian-Kuwaiti Bank; Tunisia) |
| BTK | Basic Tool Kit (necesary supplies) |
| BTK | Boutokaan Te Koaua Party (Kiribati) |
| BTK | Back to Keyboard |
| BTK | Birth Thru Knowledge (band) |
| BTK | Blood Thirsty Killers (gaming clan) |
| BTK | Behm-Titan-Kaiser (French trailer manufacturer) |
| BTK | Baby, Toddler, Kid (clothing) |
| BTK | Baccillus Thuringiensis Kurstaki |
| BTK | Büntetõ Törvény Könyv (Criminal Code in Hungary) |
| BTK | Beartooth Kawasaki (Red Lodge, Montana) |
| BTK | Block for Transfer and Correction |
| BTK | Bundestierarztekammer |
| BTK | BTK Technology Development Co., Ltd |