7900 may refer to:
Technology GeForce 7900 series, a line of graphics processing units from Nvidia Nikon Coolpix 7900, a digital camera model Nokia 7900, a mobile phone model Radeon HD 7900 series, a line of graphics processing units from AMD released 2011 Radeon RX 7900 series, a line of graphics processing units from AMD released 2022
Transportation PCC 7900, a streetcar type Volvo 7900, a model of rigid and articulated buses