Keith Bunin is an American dramatist and screenwriter. His plays include 10 Million Miles (Linda Gross Theatre); Sam Hendrix at the Bon Soir (City Theatre Hamburg Studio); The Unbuilt City (Hallie Flanagan Davis Powerhouse Theater); and The Credeaux Canvas, The World Over, and The Busy World is Hushed (Playwrights Horizons). 

He wrote the screenplay for the film Horns, based on the novel by Joe Hill and starring Daniel Radcliffe, and co-wrote the screenplay for the film Which Brings Me to You with Richard Brown.

Bunin also wrote the "Oliver" episodes for season 2 of the HBO series In Treatment.