G4

G4 is the name of:

• PowerPC G4 – a type of microprocessor used by Apple Computer
• G4 (television) – a gaming-oriented television channel
• G4 (band) – a pop group on the ITV television programme The X Factor

G4 may also refer to:

• Gulfstream G400 and G450 – private jets
• G4 star – a subclass of G-class stars
• Group 4 of the periodic table
• G4 nations – four major nations seeking seats on the UN Security Council: Germany, Brazil, Japan, and India
• G4 bloc – China, India, Brazil, and South Africa—the core leadership of the larger G20 trade bloc within the World Trade Organization
• Santa Clara County Route G4 – a county highway in Santa Clara County, California, USA