Tracy S. Letts is an American actor, playwright, and screenwriter. Born on July 4, 1965, in Tulsa, Oklahoma, he started his career at the Steppenwolf Theatre before making his Broadway debut as a playwright with August: Osage County (2007), for which he received the Pulitzer Prize for Drama and the Tony Award for Best Play. As an actor, he won the Tony Award for Best Actor in a Play for the Broadway revival of Who's Afraid of Virginia Woolf? (2013).

Letts is known for writing for the Steppenwolf Theatre, Off-Broadway, and Broadway theatre. His notable works include Killer Joe, Bug, Man from Nebraska, August: Osage County, Superior Donuts, Linda Vista, and The Minutes. He adapted some of his plays into films, such as Bug and Killer Joe, both directed by William Friedkin, and August: Osage County, directed by John Wells. His play Superior Donuts was adapted into a television series.

As a stage actor, Letts has performed in classic plays at the Steppenwolf Theatre since 1988. He made his Broadway acting debut as George in the revival of Edward Albee's play Who's Afraid of Virginia Woolf?, earning him a Tony Award for Best Actor in a Play. He continued performing on Broadway in productions such as The Realistic Joneses, All My Sons, and The Minutes.

In film and television, Letts is known for his roles as Andrew Lockhart in Showtime's Homeland and Nick in HBO's comedy series Divorce. In 2017, he starred in The Lovers, Lady Bird, and The Post, with Lady Bird earning him a nomination for the Screen Actors Guild Award for Outstanding Performance by a Cast in a Motion Picture. In 2019, he portrayed Henry Ford II in Ford v Ferrari and Mr. Dashwood in Little Women, both of which received Best Picture nominations.