DBL may refer to:
- Dansk Biografisk Leksikon, a Danish biographical dictionary
- Dashing Buffalo, a professional League of Legends team based in Ho Chi Minh City, Vietnam
- Database Management Library, a C++ object-oriented programming library
- dBase Language, the computer language implemented by dBASE Plus, dB2K, and Visual dBASE software
- Design-based learning, a modern pedagogy
- Devizes branch line, a defunct railway line running from Holt to Pewsey from 1857 to 1966
- Digital Bibliography & Library Project's DBL-Browser
- Don Bosco High & Technical School, Liluah, an all-boys, English medium school near the city of Kolkata, India
- Double (disambiguation), various meanings
- Double bottom line, an accounting framework that measures fiscal performance
- Drawing Black Lines, the second album by American Post-Hardcore band, Project 86
- Drexel Burnham Lambert, an investment bank
- Dunstan Baby Language, a theory about early baby language
- Dyirbal language, ISO 639-3 language code dbl