ADO Ampex Digital Optics (a formerly renowned digital video effects system by Ampex)

ADO Den Haag, a football club

Hokkaido International Airlines, from its ICAO code

Ado (archbishop) (d. 874)

Autobuses de Oriente, a passenger bus service in Mexico

Ado's Theorem

Assyrian Democratic Organization

Australian Defence Organisation

Eduardo Roberto Stinghen, a Brazilian footballer

Ado (monk), a monk of Goguryeo

ActiveX Data Objects, a Microsoft API

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