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The concept of establishing an independent school in the Great Southern region arose from families seeking an independent school alternative.
Great Southern Grammar was founded in 1996 by a development committee.
The school was incorporated in 1998 and those who had worked to establish it became the first Board of Trustees.
The school opened in 1999 with 36 students at a temporary campus, after which a building masterplan was commenced to establish permanent facilities at Lower Kalgan.
The school moved into its new home on the shores of Oyster Harbour in Term One, 2000.
When local Noongar elder, Mr Aiden Eades, spoke at the opening ceremony of the school he stated, "The school grounds are of special significance to local Noongars, with the Kalgan and the King rivers meeting close by. Never forget that this is Noongar land but you are welcome to use it, especially for something like education."
GSG has grown steadily, with enrolments reaching 725 for Kindergarten to Year Twelve in 2019.