Tim Blake Nelson (born January 11, 1964) is an American actor and director, known for his versatility and character roles in independent and high-profile film productions.

He gained widespread recognition for his portrayal of the bumbling and naive Delmar O'Donnell in the Coen brothers' *O Brother, Where Art Thou?* (2000), a role that highlighted his distinctive humor and musical abilities.

Nelson is praised for his ability to embody eccentric, intellectual, sometimes vulnerable or desperate characters, often with a distinctive rural cadence or keen intelligence. His peculiar voice and unique screen presence make him instantly recognizable. His other notable film appearances include *Syriana* (2005), *Lincoln* (2012), and the titular performance in the opening segment of the Coen brothers' *The Ballad of Buster Scruggs* (2018). His career is studded with memorable roles that attest to his versatility and interpretive prowess.