IGS or Igs may refer to:
Computing Information Global Service, Japanese video game company Initial Graphics Exchange Specification, file extension .igs InteGraphics Systems a former chip manufacturer Interactive geometry software Internet Go server, for the game of Go IGS Go server, Japanese Go server
Technology Image guided surgery Information Gathering Satellites, Japan Instrument guidance system
Science Institute of General Semantics Intergenic spacer International Glaciological Society International Graphonomics Society International GNSS Service Ig Nobel Prize, sometimes referred to as the "Igs"
Schools Ilkley Grammar School International Grammar School, Sydney Ipswich Grammar School Islington Green School
Other Imerslund-Gräsbeck syndrome International Graduates Scheme, a UK immigration scheme Irish Georgian Society Ingolstadt Manching Airport, is a military airbase with civil usage located in Manching near Ingolstadt, Germany