ADSI may refer to:
- Superintendent (police), Acting Detective Superintendent
- Active Directory Service Interfaces, a technology introduced by Microsoft in the Windows 2000 Operating System
- Analog Display Services Interface, application used by many screen-based analog telephones to work with optional calling services
- American Defense Systems, Inc., provider of transparent and opaque armor, architectural hardening and security products
This disambiguation page lists articles associated with the title ADSI.
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