DDL may be an abbreviation for:
Technology:
- Data Definition Language or Data Description Language, relating to databases
- Data-Driven Learning, in language acquisition learning of a language through corpus analysis
- Description Definition Language, part of the MPEG-7 standard
- Design Document Listing, stable reference outlining all parts of a software system
- Didanosine, an antiretroviral drug
- Digital Data Link
- Diode-Diode Logic, boolean logic gates from diodes
- Direct download link, hyperlink for file download
- Dolby Digital Live, real-time audio compression
- Drop-down list, graphical user interface control element
- Dungeon Definition Language
- Dynamic Distribution List, list of email addresses
- An acronym for the Australian light destroyer project
Other:
- Daniel Day-Lewis, Academy Award winning Irish/English actor
- Den Danske Landinspektørforening, the Danish Association of Chartered Surveyors
- Det Danske Luftfartselskab, Danish airline
- Dulce de leche, a milk-based syrup
- Dutch Defence League, a Dutch offshoot of the English Defence League.