Timothy Blake Nelson (born May 11, 1964) is an American actor and playwright. He has been called a "modern character actor"; his roles include Delmar O'Donnell in O Brother, Where Art Thou? (2000), Gideon in Minority Report (2002), Dr. Steve Pendanski in Holes (2003), Dr. Jonathan Jacobo in Scooby-Doo 2: Monsters Unleashed (2004), Danny Dalton Jr. in Syriana (2005), Samuel Sterns in the Marvel Cinematic Universe, Richard Schell in Lincoln (2012), the title character in The Ballad of Buster Scruggs (2018), and Henry McCarty in Old Henry (2021). He played Wade Tillman / Looking Glass in the HBO miniseries Watchmen (2019), for which he received a 2020 Critics' Choice Television Award nomination for Best Supporting Actor in a Drama Series.

Nelson's directing credits include Eye of God (1997), which was nominated for the Sundance Grand Jury Prize and an Independent Spirit Award; O (2001), a modern adaptation of Othello; and the Holocaust drama The Grey Zone (2001). Eye of God and The Grey Zone were adapted from Nelson's own plays. Nelson also co-directed music videos for Billy Woods and Kenny Segal, including "Babylon by Bus" and "Soft Landing." He also co-directed the music video for Armand Hammer featuring Pink Siifu, "Trauma Mic."

Nelson recently published his debut novel, City of Blows (2023), an epic group portrait of four men fighting for control of a screenplay in a radically changing Hollywood.

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