Past winners of this category include Mahershala Ali, Jared Leto, and Christoph Waltz.

What qualifies as "supporting" according to the Academy? Well, the role is usually not the main protagonist of the film. Think Brad Pitt in Once Upon a Time...in Hollywood or Walter Brennan in Come and Get It. In fact, the latter is the most supportive actor, it seems, with three Oscar wins in the category.

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