G4, also known as G4 TV, is an American television network, originally geared primarily toward young male adult viewers, originally based on the world of video games. Currently the channel has a male oriented focus, although video games are still represented by the channel.

Launched on April 24, 2002, G4 is headquartered in Los Angeles, California, United States, and owned by G4 Media, which is owned by NBCUniversal, whom Comcast acquired 51% of in early 2011.

G4 was initially created by Comcast. The initial concept was to create a service similar to TechTV but "geared more toward MTV's demographics". The network was launched with thirteen original series.

The launch shows consisted of:

G4 was created and originally led by Charles Hirschhorn, a former president of Walt Disney Television and Television Animation. He expected video game creators themselves to eventually produce programming for the network. He envisioned that G4 could follow in the footsteps of MTV which in his opinion provided music video producers with a venue for non-traditional television programming. Hirschhorn intended G4 to become a vehicle for unconventional advertising. In 2002, G4 offered advertisers wide latitude to place their products on G4's programs, and even allowing their commercials to appear as if they're a part of the program. G4 also offered what was called a "2 minute unit" which was an advertising package played as if it were part of a G4 program that was long enough to run an entire movie trailer. G4 also offered to sell the right to have a game showcased on the show Pulse.