GI, G.I. or Gi may refer to:
Military G.I., a nickname for U.S. Army soldiers that has been explained as an abbreviation for various different expressions Government issued, a class of equipment produced for government use and one of the explanations for the above term
Sports Gymnastics Ireland, a governing body Greg Inglis (born 1987), Australian rugby league footballer Keikogi (), a Japanese martial arts uniform known in English simply as a gi
Arts and entertainment GI (album), an album by the Germs Gi (Captain Planet character) Game Informer, a magazine Gert's Inferno, a comic book series Global Icon (band), a South Korean group Genshin Impact, an action role-playing gacha game developed by miHoYo
Language, geography, and transportation
Gi (kana), a syllabic character in Japanese script Gi (cuneiform), a sign in cuneiform writing Gi (digraph), one of several digraphs Goethe-Institut, a German cultural association Guaranteed Irish, a business membership network Geographical indication, on products that come from a geographical location or origin Gibraltar (ISO 3166-1 code GI), a disputed British Overseas Territory in the Iberian Peninsula Government Issue, an American punk band Guduvancheri railway station (Indian Railways code GI), in Chennai, Tamil Nadu, India Itek Air (IATA code GI), a 1999–2010 airline based in Kyrgyzstan
Science and technology Galvanized iron, a kind of metal
Biology and medicine Gi alpha subunit, a part of some proteins Gastrointestinal tract (GI tract), the main part of the digestive system Gigantocellular reticular nucleus (Gi), a subregion of the medullary reticular formation Glycemic index, a measure of a food's effect on blood glucose Gender incongruence
Computing GI, a complexity class in the graph isomorphism problem .gi, the ccTLD for Gibraltar Gi (prefix symbol) (gibi), a binary prefix Global illumination, a group of 3D graphics algorithms
Computing organizations
General Instrument, an American electronics company that specializes in manufacturing semiconductors and cable television equipment German Informatics Society (), a German professional society for computer science Graphics Interface, a conference on computer graphics and human–computer interaction
See also G.I. Generation (or Greatest Generation), a demographic cohort G.I. Joe (disambiguation) G1 (disambiguation) GL (disambiguation)