NGO is an abbreviation for non-governmental organization. It also may refer to: Ngô (吴), a Vietnamese surname equivalent to Chinese name Ng or Wu Wu (surname), Ngo in Hokkien Ao (surname), Ngo in Cantonese .ngo, a file extension for an NG Linker Object (NGML) file New Gravitational-wave Observatory, a European Space Agency project Chūbu Centrair International Airport, IATA airport code designation Nagoya Airfield, its former designation