XG or xG may refer to:
Organizations XG Technology, a wireless communications company Clickair (former IATA code: XG), a 2006–2009 Spanish low-cost airline SunExpress Deutschland (former IATA code: XG), a 2011–2020 German leisure airline
Science and technology Xg antigen system, a red blood cell surface antigen system DARPA XG, a DARPA communication program Hyundai XG, a Hyundai car model Yamaha XG, a Yamaha extension to the General MIDI standard
Other uses XG (group), a vocal group Extreme-G, a video game Expected goals (xG), a performance metric used to evaluate football team and player performance