GI

GI or Gi may refer to:

Military

 * G.I., a nickname for U.S. Army soldiers and equipment

Arts and entertainment

 * GI (album), an album by the Germs
 * Gi (Captain Planet character)
 * Game Informer, a magazine
 * Global Icon (band), a South Korean group
 * Great Intelligence, an enemy of the Doctor in Doctor Who

Organisations

 * Goethe-Institut, a German cultural association
 * General Instrument, an electronics company
 * Gesellschaft für Informatik, a German computer society
 * Itek Air (IATA airline designator), a former airline based in Kyrgyzstan
 * Guaranteed Irish, a business membership network

Science and technology

 * GI, a complexity class in the graph isomorphism problem
 * Galvanized iron

Biology and medicine

 * Gi alpha subunit, a protein
 * Gastrointestinal tract (GI tract)
 * Gigantocellular reticular nucleus, a subregion of the medullary reticular formation
 * Glycemic index, measuring a food's effect on blood glucose

Computing

 * .gi, the country code top-level domain for Gibraltar
 * Gi (prefix symbol) (gibi), a binary prefix
 * Global illumination, a group of 3D graphics algorithms

Other uses

 * Gibraltar (ISO 3166-1 country code)
 * G.I. Generation, a demographic cohort
 * Graphics Interface, a conference on computer graphics and human–computer interaction
 * Geographical indication, on products which corresponds to a geographical location or origin
 * Gi (kana), a syllabic character in Japanese script
 * Gi (cuneiform), a sign in cuneiform writing
 * Greg Inglis (born 1987), Australian rugby league footballer