People will be able to see the Guildford Grammar School blazer worn by the late Academy Award-winning actor when the free exhibition runs from October next year to January 2018.
Arts Minister John Day, an Old Guildfordian, announced the exhibition along with the gallery, WA Museum and Ledger family at the weekend.
Mr Day said the exhibition would show the huge talent of Ledger as an actor, his aspirations as a director and provide a window into his early life growing up in Perth.
“Heath Ledger carved an incredible place in the history of cinema with his prodigious talent and dedication to his art,” Mr Day said.
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“He was much more than a charismatic movie star – Heath Ledger was a passionate, deeply committed film-maker who partnered with some of the world’s great directors, actors and crews to achieve unforgettable performances.”
Ledger’s Academy Award for his role as the Joker in The Dark Knight will be on display, as well as personal items such as a diary he kept when creating his Joker role.