ADOS may refer to:
- Autism Diagnostic Observation Schedule, an instrument for diagnosing and assessing Autism
- Atari ADOS, another name for DOS XE for Atari 8-bit computers
- Arabic MS-DOS, a special variant of Microsoft's MS-DOS localized for Arabic countries
- Advanced DOS, an original project name for IBM and Microsoft OS/2 1.0
- Access DOS, a DOS driver suite by Trace Research and Development Center, Madison, Wisconsin, USA to assist disabled user, shipped as a supplement to Microsoft's MS-DOS 6.2x
- АДОС (Cyrillic) aka Alpha DOS, a Russian operating system developed around 1989 and said to be MS-DOS 3.2 compatible
- A Dream of Spring, the forthcoming novel in the A Song of Ice and Fire book series
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