- Association For The Development Of Pakistan , a Boston-based non-profit organization
- Access Database Project , a file format of the Microsoft Access database program
- Adenosine Diphosphate , a nucleotide
- Aéroports De Paris (see Air Travel In France ), airport authority for the Parisian region
- ALAD Deficiency Porphyria (see List Of Genetic Disorders ), a genetic disorder
- Alpha Delta Pi , a Sorority organization on college campuses.
- AOLserver Dynamic Pages , web server extensions designed to return dynamically created documents based on the Tcl computer programming language used by AOLserver
- Automatic Data Processing, Inc. , a payroll and tax filing processing company
- Area Development Project
- Azerbaijan Democratic Party
- Andorran Peseta , the former currency of Andorra
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