Notable Actors Without An Oscar
quite a list
https://m.imdb.com/poll/OpaeupbBTEs/?ref_=m_nm_po
who do you think is the greatest omission, and what film should most merit their award ?
don't limit yourself to that list, if you have another actor in mind.
edit: here's a more exhaustive list
https://www.ranker.com/crowdranked-list/greatest-actors-who-have-never-won-an-oscar
pretty incredible the number of great actors who never got that award, and the lesser ones who did.