The Greater Brisbane Conference of GBC is an association formed by a group of co-educational, independent, secondary schools.

The GBC association was formed primarily to conduct interschool sporting competition. GBC is a vibrant, high quality competition, which currently has 6 member colleges and conducts their weekly sporting competitions for boys and girls on Saturday mornings in terms 1 and 2 and 3 of the school year. The GBC schools also band together to participate in Swimming, Cross Country and Track & Field Championships throughout the year.