3G is a generation of standards for mobile telecommunication.
3G may also refer to:

3G Capital, a Brazilian investment firm
Global Governance Group, an informal group of smaller and medium-sized counties represented in the G20 summits
3G (countries) or Global Growth Generators countries (the most promising growth prospects countries)
3G (film), a Bollywood film
3G pitch, a third-generation astroturf, used in many sports such as football
3G Studios, an independent video game development studio
CURB/Agajanian/3G Racing, a team in the Indy Racing League IndyCar Series and NASCAR Nationwide Series
a third-generation immigrant; see Immigrant generations
Apartment 3-G, an American newspaper comic strip about a trio of career women
Hutchison 3G, a brand name under which several UMTS-based mobile phone networks operate
iPhone 3G, a smartphone sold by Apple Inc.
NTFS-3G, an open-source cross-platform implementation of the Microsoft Windows NTFS file system
Stephane & 3G, a Georgian pop group
Sudan Yellow 3G, a yellow azo dye