Championship Gaming Invitational, a Video Game tournament themed show shown on DirecTV

Common Gateway Interface, a technology used in web servers

Computer-generated imagery, application of computer graphics to special effects in films, television programs etc.

Cell Global Identify, unique identifier of a cell site in cellular networks such as GSM and UMTS

Corrugated Galvanised Iron, molded sheet-metal

CGI Group, a Canadian headquartered information management company (formerly Conseillers en Gestion et Informatique C.G.I. Inc.)

Clinical Global Impression, a scale to assess treatment response associated with mental disorders

CGI.pm, a Perl module used for dealing with it

Computer graphics interface, a low-level interface between the Graphical Kernel System and the hardware

Cuerpo Guardia de Infantería, an Argentine police riot control service

Cape Girardeau Regional Airport (IATA airport code: CGI) in Cape Girardeau, Missouri, United States