ADS may stand for:

• Active Defense Systems
• Active Directory Service - a directory implementation by Microsoft
• Advance Direction Sign
• Advanced Distributed Simulation
• Advantage Database Server - a client/server database created by Extended Systems
• Aerial Delivery Sling
• Air Data System
• Alcohol Dependance Scale - Twenty-five item scale developed by the Addiction Research Foundation
• Alternate data stream - a feature of file systems such as Microsoft's NTFS
• Alternative Delivery System
• American Depositary Shares on the New York Stock Exchange
• Annotation Data Set
• Applet Development Server
• Applicant Data System
• Archaeology Data Service
• Area Detection System
• the NASA Astrophysics Data System
• Attention Deficit Syndrome
• Autographed Document Signed
• Automatic Dependent Surveillance
• Auxiliary Data Store
• Advertisement - short for