ADOS may refer to:
- American Descendants of Slavery, a descriptive term and political movement
 - Autism Diagnostic Observation Schedule, a diagnostic test
 - The novel A Dream of Spring in the book series A Song of Ice and Fire
 
Computer operating systems
- Access DOS, assistive software shipped with Microsoft's MS-DOS 6.2x
 - ADOS (Russian operating system) (or АДОС), ca. 1989
 - Advanced DOS, a project name for IBM and Microsoft's OS/2 1.0
 - Arabic MS-DOS, from Microsoft
 - Atari DOS, an 8-bit disk operating system used in Atari computers
 
See also
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