 The school is affiliated with the Headmasters' and Headmistresses' Conference, the Association of Heads of Independent Schools of Australia (AHISA), the Junior School Heads Association of Australia (JSHAA), and is a founding member of the Associated Grammar Schools of Victoria (AGSV).The school is also a member of the G20 Schools Group.Ivanhoe Grammar School is also one of only four Round Square schools in the state of Victoria, and has been an International Baccalaureate World School since December 1994.