YG may refer to:
- YG Entertainment, a Korean entertainment company
- Young Greens (disambiguation), one of several youth wings of Green parties (or members thereof)
- yocto (-) gram (yg) or yotta (-)gram (Yg), two SI units of mass
- Yogurt (food code: YG)
- YG (rapper), a rapper from Paramount, California, United States
- Young Guns (band), and alternative rock band from Buckinghamshire, UK
- Yuri Gagarin, first human in space