Ado 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
• Adeleine, a character in Kirby's Dream Land 3 as a boss and as an ally in Kirby 64: The Crystal Shards

de:Ado es:ADO (desambiguación) eo:ADO fr:ADO ko:ADO it:ADO nl:ADO ja:ADO pt:Ado ksh:ADO (Watt ?ßß datt?) zh:ADO (???)