Geelong Grammar School is a private Anglican co-educational boarding and day school. The school's main campus is located in Corio on the northern outskirts of Geelong, Victoria, Australia, overlooking Corio Bay and Limeburners Bay.

Corio is a residential and industrial area, which forms one of the largest suburbs of Geelong, Victoria in Australia. It is located approximately 9 km north of the Geelong central business district. The area was formerly known as Cowie's Creek after James Cowie, an early land owner who was active in the local and state government.