DDL may refer to:
Technology Data definition language or data description language, relating to databases Description Definition Language, part of the MPEG-7 standard Device Description Language, related to field devices for process and factory automation Digital data logger, a type of data logger, an electronic device that records data over time or in relation to location Direct download link, hyperlink for file downloads Dolby Digital Live, real-time audio compression Drop-down list, graphical user interface control element An acronym for the Australian light destroyer project
People Daniel Day-Lewis, actor
Businesses Det Danske Luftfartselskab, Danish airline Dutch Defence League, a Dutch offshoot of the English Defence League
Other Data-driven learning, an approach to learning foreign languages Den Danske Landinspektørforening, the Danish Association of Chartered Surveyors