G band may refer to:
- G band (IEEE), a millimetre wave band from 110 to 300 GHz
- G band (NATO), a radio frequency band from 4 to 6 GHz
- G band, representing a green hued wavelength of 464 nm in the photometric systems adopted by astronomers
- G banding, in cytogenetics
- The G Band, alternative name of The Glitter Band