CGO may refer to:

• Carlson, Gaskey & Olds: an intellectual property firm based in Birmingham, Michigan
• Catalogue of Galactic O Stars, an astronomical catalogue
• Central Gilts Office
• Ceria gadolinium oxide (used in Solid Oxide Fuel cells (SOFC))
• CGO Ecology Limited, a UK-based ecological consultancy business
• Cgo, a subsystem in the Go programming language which enables the creation of Go packages that call C code
• Chief governance officer
• Chief governing officer
• Company-grade officer
• Chief growth officer
• Royal Concertgebouw Orchestra, a symphony orchestra of the Netherlands
• Zhengzhou Xinzheng International Airport (IATA: CGO)
• Cambridge Graduate Orchestra at Cambridge, UK
• International Symposium on Code Generation and Optimization
• Republic of the Congo (FIFA and IOC code: CGO)