David Russell Strathairn (/strəˈθɛərn/; born January 26, 1949) is an American actor. Known for his leading roles on stage and screen, he has often portrayed historical figures such as Edward R. Murrow, J. Robert Oppenheimer, William H. Seward, and John Dos Passos. He has received various accolades including an Independent Spirit Award, a Primetime Emmy Award, and a Volpi Cup, and has been nominated for an Academy Award, a BAFTA Award, two Golden Globe Awards, and four Screen Actors Guild Awards.

Strathairn made his acting debut in his fellow Williams College graduate John Sayles' film Return of the Secaucus 7 (1980), and continued acting in multiple films by Sayles, such as Matewan (1987), Eight Men Out (1988), City of Hope (1991), Passion Fish (1992) and Limbo (1999). In the 1990s, he appeared in multiple box-office successes such as A League of Their Own (1992), Sneakers (1992), The Firm (1993), The River Wild (1995) and L.A. Confidential (1997) before gaining prominence for his portrayal of journalist Edward R. Murrow in George Clooney's Good Night, and Good Luck (2005), for which he was nominated for an Academy Award for Best Actor. He is also recognized for his role as CIA Deputy Director Noah Vosen in The Bourne Ultimatum (2007) and The Bourne Legacy (2012). He appeared in Steven Spielberg's Lincoln (2012), Chloe Zhao's Nomadland (2020), and Guillermo del Toro's Nightmare Alley (2021).

Also known for his lengthy work on television, he made his debut in the soap opera Search for Tomorrow in 1984. He portrayed Robert Wegler in the acclaimed HBO drama series The Sopranos (2004). He received a Primetime Emmy Award win and a Golden Globe Award nomination for his performance in the HBO television film Temple Grandin (2010). He portrayed John Dos Passos in the HBO film Hemingway & Gellhorn (2012). He's had recurring roles in the Syfy series Alphas (2011–2012), the NBC series The Blacklist (2015–2016), the Showtime series Billions (2017–2019), and the SyFy, then Amazon Prime Video, series The Expanse (2018–2019).

Strathairn was born on January 26, 1949, in San Francisco, California. He is of Scottish descent through his paternal grandfather, Thomas Scott Strathairn, a native of Crieff, and of Native Hawaiian and Chinese ancestry through his paternal grandmother, Josephine Lei Victoria Alana. Strathairn attended Redwood High School in Larkspur, California. He graduated from Williams College in Williamstown, Massachusetts, in 1970. At Williams, he met fellow actor Gordon Clapp; and (after graduation) another Williams alumnus, director John Sayles, with whom he has collaborated on a number of projects.

He studied clowning at the Ringling Brothers and Barnum & Bailey Clown College in Venice, Florida, and briefly worked as a clown in a traveling circus.

Strathairn is a character actor, appearing in supporting roles in many independent and Hollywood films. In this capacity, he has co-starred in Twisted as a psychiatrist; in The River Wild as a husband; and in Blue Car as a teacher. Other notable film roles include his portrayals of baseball player Eddie Cicotte in Eight Men Out (1988); Col. Craig Harrington in Memphis Belle (1990); Whistler, the wisecracking blind techie, in Sneakers (1992); convict Ray McDeere in the legal thriller The Firm (1993); abusive husband Joe St. George in Dolores Claiborne (1995); Pierce Patchett, a millionaire involved in the seedy side of 1950s Los Angeles in L.A. Confidential (1997); Theseus, Duke of Athens, in the 1999 version of A Midsummer Night's Dream; and the title character in Harrison's Flowers (2000)

He has frequently worked with his Williams College classmate and director John Sayles. He made his film debut in Sayles' Return of the Secaucus 7, and appeared in his films Eight Men Out, Passion Fish, Matewan, Limbo, and City of Hope, for which he won the Independent Spirit Award. Alongside Sayles, he played one of the "men in black" in Sayles' 1983 film The Brother from Another Planet.

Strathairn's television work also includes a wide range of roles: Moss, the bookselling nebbish on the critically acclaimed The Days and Nights of Molly Dodd; Captain Keller, the father of Helen Keller in the 2000 remake of The Miracle Worker; Capt. Frederick Benteen, a U.S. 7th Cavalry officer under General Custer's command in Son of the Morning Star; and a far-out (both figuratively and literally) televangelist in Paradise, the pilot episode for a TV series on Showtime that was not successful. Strathairn had a recurring role on the hit television drama The Sopranos. Strathairn starred in the Miami Vice episode "Out Where the Buses Don't Run."