• Action description language, a formal language for automatic planning systems
• Activities of daily living
• Adelaide Airport, from its IATA airport code
• Amalgamated Dairies Limited, The largest dairy production company on Prince Edward Island, Canada
• ADL (artist)
• Adlington (Lancashire) railway station, United Kingdom, from its National Rail code
• Adrenoleukodystrophy
• Advanced Distributed Learning
• Adventure Definition Language
• Autoregressive Distributed Lag, dynamic single-equation regressions
• Aerobic Dive Limit
• Alexander Dennis Limited, UK bus manufacturer.
• American Dialect Society
• Anthony DeMaria Labs, audio equipment manufacturer
• Anti-Defamation League, Jewish interest group whose goal is to "stop ... the defamation of the Jewish people."
• Approved Design Ltd, ADL Food Processing Equipment
• Archetype definition language
• Architecture description language
• Argument dependent name lookup
• Arthur D. Little, the world's first management consulting firm.
• Asian Digital Libraries, a group of Digital library
• Assertion definition language
• The ICAO Code for Aero Dynamics, United Kingdom
• The New Zealand Rail Limited (NZR) ADL class of diesel multiple unit train

See also

• Adl, the Arabic word for justice.