ADP

ADP, a three-letter abbreviation]], may refer to:

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