WCG may refer to:
- World Choir Games
- World Cyber Games, an international e-sports event also known as "Cyber Games Festival"
- Wide Color Gamut, a certain complete subset of colors
- World Community Grid, a public computing grid for scientific research projects
- Worldwide Church of God
- WCG is an agency specializing in creative, interactive, and marketing communications services for consumer product, entertainment, healthcare, and technology clients.