BDZ may refer to:
- Benzodiazepines, a class of drugs
- Bulgarian State Railways (Balgarski Darzhavni Zheleznitsi in Bulgarian)
- BDZ (album), a 2018 album by Twice
- "BDZ" (song), a song from the album
- bdz, the ISO 639-3 code of the Badeshi language
BDZ may refer to: