ADN is a three-letter acronym that may refer to:

In Technology:

• Adobe Digital Negative (file format), a raw image format designed by Adobe Systems
• Application Delivery Network, a suite of technologies for improved delivery of applications across the Internet
• Autodesk Developer Network, a program for developers working with Autodesk software
• Aircraft Data Network, a proposed specification for data networking standards for commercial aircraft installations
• Advanced Digital Network, a leased 56k digital phone line used commonly with mainframe terminal multiplexers

In Sciences:

• Auditory Disability with Normal hearing, a term for King-Kopetzky syndrome
• Ammonium dinitramide, a rocket propellant

In Politics:

• Acción Democrática Nacionalista (Nationalist Democratic Action), a political party of Bolivia
• Alleanza Democratica Nazionale (National Democratic Alliance (Italy)), a former political party of Italy

In Media:

• Allgemeiner Deutscher Nachrichtendienst, the state news agency of East Germany
• Anchorage Daily News, an Alaskan newspaper
• ADN (newspaper), a Spanish free daily newspaper

In Education:

• Associate Degree in Nursing, similar to Associate of Science in Nursing
• Assistant Director of Nursing

In other uses:

• Abbreviated dialing number
• ADN, IATA airport code for Andes Airport in Andes, Antioquia, Colombia
• ADN, National Rail code for Ardrossan Town railway station, United Kingdom
• "Any Day Now", as abbreviated in text messaging

• Ashley, Drew and Northern Railway, a defunct railroad in Arkansas

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