CGI may refer to:

• Computer-generated imagery, computer-graphic effects in films, television programs, and other visual media
• Computer Graphics Interface, the low-level interface between the Graphical Kernel System and hardware
• Common Gateway Interface, a standard for dynamic generation of web pages by a web server
  • CGI.pm, a Perl module for implementing Common Gateway Interface programs
• Compacted graphite iron, a type of cast iron
• Corrugated galvanised iron, a type of molded sheet metal
• Cell Global Identity, a standard identifier for mobile phone cells

• California Graduate Institute, an independent graduate school specializing in psychology
• Catholic Guides of Ireland, a Girl Guide association
• Chulabhorn Graduate Institute, a private graduate institute in Thailand
• CGI Aero or RusAir, a Russian airline
• CGI Inc., a multinational information technology and business process services company
• Clinton Global Initiative, a forum created by former US President Bill Clinton to discuss global problems
• Coast Guard Intelligence, the intelligence branch of the United States Coast Guard
• Commission for the Management and Application of Geoscience Information
• Compagnie Générale Immobiliere, a Moroccan real-estate development company
• Consultative Group on Indonesia, a former consortium of donors to the Indonesian government
• Cuerpo Guardia de Infantería, an Argentine police riot control service
• General Commissariat of Information, the Comisaría General de Información is an intelligence service within the National Police Corps of Spain.

• Clinical global impression, a family of scales to assess treatment response associated with mental disorders
• Cognitively Guided Instruction, an approach to mathematics teaching and learning
• CpG islands, in genetics, genomic regions that contain a high frequency of CG dinucleotides
• Cape Girardeau Regional Airport (IATA airport code: CGI), an airport in Missouri, US

• All pages with titles beginning with CGI
• All pages with titles containing CGI