White stars as Chef Carmy Berzatto on "The Bear" which is shot in and set in Chicago.
Posters around the city say The Jeremy Allen White lookalike competition will take place at 1 p.m. on Saturday on the "big hill" in Humboldt Park.
The posted says there will be a $50 cash prize for the winner and "some cigarettes."
It's unclear who's organizing the event but it follows several other recent celeb lookalike contests.
Last month a Timothée Chalamet contest went viral in New York City after the actor made a surprise appearance.