GS2
GS2 may be a shorthand reference to:
In technology
- Samsung Galaxy S II, smartphone
- Samsung Gear S2, smartwatch
- Blue Origin New Glenn stage 2, space launch rocket upper stage
In video games
- Galactic Civilizations II
- Golden Sun: The Lost Age
- Phoenix Wright: Ace Attorney − Justice for All, known in Japan as Gytakuten Saiban 2
Other uses
- GS-II (1,3-beta-glucan synthase), an enzyme