GS
- Gs – (s) Gigasecond
- GS
- (i) General Support
- (s) Gigasiemens
- South Georgia and the South Sandwich Islands (ISO 3166 digram)
- GSR – (i) Gun Shot Residue
- GS-R – (i) General Support-Reinforcing
- GSA – (i) U.S. General Services Administration
- GSD – (i) Graphical Situation Display
- GSG
- (i) German Sport Guns
- Global Scenario Group (former environmental research organization)
- Grenzschutzgruppe (German, "Border Guard Group" — Germany's GSG 9 counterterrorist unit was originally a special branch of the border police)
- GSK – (p) GlaxoSmithKline
- GSM
- (i) General Service Medal
- Grams per Square Metre (paper thickness; properly g/m2)
- Ground Station Module
- Groupe spécial mobile (French, "Special Mobile Group"; official expansion is now Global System for Mobile Communications)
- GSN – (a/i) Game Show Network
- GSO – (i) General Services Officer (U.S. Department of State)
- GSOH – (i) Good Sense Of Humour
- GSP – Georges St-Pierre (Canadian MMA fighter)
- GSS – (i) Generic Security Services
- GST – (i) Goods and Services Tax (Australia, Canada, and other countries)
- GSW – (i) Gun Shot Wound
Read more about this topic: List Of Acronyms And Initialisms: G