Organizations
- ADL astronomical society Slovenian most popular astronomical society
- Alexander Dennis Limited, the UK's largest bus manufacturer
- Amalgamated Dairies Limited, a dairy production company on Prince Edward Island, Canada
- Animal Defense League
- Anthony DeMaria Labs, an audio equipment manufacturer
- Anti-Defamation League, an international non-governmental organization based in the United States
- Arthur D. Little, a management consulting firm
- Armenian Democratic Liberal Party (ADL) or Ramgavar Party, a political party
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