Michael Stewart Stuhlbarg ( STOOL-barg; born July 5, 1968) is an American actor. He is known as a character actor having portrayed a variety of roles in film, television and theatre. He has received two Screen Actors Guild Awards and a Drama Desk Award. He has also received numerous award nominations including for two Primetime Emmy Awards, a Tony Award, and a Golden Globe Award.

He rose to prominence as troubled university professor Larry Gopnik in the 2009 dark comedy film A Serious Man, directed by Joel and Ethan Coen. Stuhlbarg has since become known as a character actor and has appeared in numerous films and television series portraying real life figures, such as George Yeaman in Lincoln (2012), Lew Wasserman in Hitchcock (2012), Andy Hertzfeld in Steve Jobs (2015), Edward G. Robinson in Trumbo (2015), Abe Rosenthal in The Post (2017), and Stanley Edgar Hyman in Shirley (2020). His other supporting roles include Hugo (2011), Men in Black 3 (2012), Blue Jasmine (2013), Pawn Sacrifice (2014), Arrival (2016), Call Me by Your Name, and The Shape of Water (both 2017). He joined the Marvel Cinematic Universe appearing as Nicodemus West in Doctor Strange (2016), and Doctor Strange in the Multiverse of Madness (2022).

Stuhlbarg's most notable roles in television include his performances of Arnold Rothstein in HBO's Boardwalk Empire (2010–2013), Richard A. Clarke in The Looming Tower (2018), and as Richard Sackler in Dopesick (2021), for which he was nominated for the Primetime Emmy Award for Outstanding Supporting Actor in a Limited or Anthology Series or Movie. His other television appearances include FX's Fargo (2017), Showtime's Your Honor (2020–present), and HBO's The Staircase (2022). On stage, Stuhlbarg has acted in numerous productions including the 2005 debut of Martin McDonagh's The Pillowman on Broadway, for which he won a Drama Desk Award and received a Tony Award nomination.