Big G may refer to:
- the letter G
- Big Gemini, an advanced version of the Gemini program spacecraft system
- Gravitational constant, a physical constant involved in the calculation of gravitational effects
Geography
edit- the Big G, an attraction in Gracemere, Queensland
- The Big G, a landmark in Glasgow set up for the 2014 Commonwealth Games
People
edit- Jason Giambi, American baseball player