or '''ADO''' may refer to:
- ActiveX Data Objects , a Microsoft API
- Ado (archbishop) (d. 874)
- Ado (Akan Ruler) (fl. 1550)
- Autobuses De Oriente , a passenger bus service in Mexico
- ADO Ampex Digital Optics (a formerly renowned digital video effects system by Ampex )
- Ado (monk) , a monk of Goguryeo
- ADO Den Haag , a football club
- Ado's Theorem
- Australian Defence Organisation
- Andamooka Airport , from its IATA code
- Hokkaido International Airlines , from its ICAO code
- Eduardo Roberto Stinghen , a Brazilian footballer
- Ado-Ekiti , a city in Ekiti State , Nigeria
- Ado Annie, a character who appears in the 1943 musical '' Oklahoma! '', the 1955 film ''Oklahoma'' , and the 1979 film ''Oklahoma''
- '' Ado ''', an Estonian given name
- Short form of the name Adnan
- Assyrian Democratic Organization
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