Željko Ivanek (/ˈʒɛlkoʊ ɪˈvɑːnɪk/;^[1] Slovene: [ˈʒɛːlkɔ iˈʋaːnək]; born August 15, 1957) is a Slovenian-American actor. Known for his work in film, television, and theatre, he is the recipient of a Primetime Emmy Award, a Screen Actors Guild Award, and a Drama Desk Award, as well as three Tony Award nominations.

Ivanek's film credits include Courage Under Fire (1996), Donnie Brasco (1997), Hannibal, Black Hawk Down (both 2001), Unfaithful (2002), The Manchurian Candidate (2004), Live Free or Die Hard (2007), The Bourne Legacy, Argo, Seven Psychopaths (all 2012), and Three Billboards Outside Ebbing, Missouri (2017). He has appeared in several films by Lars von Trier: Dancer in the Dark (2000), Dogville (2003), and Manderlay (2005).

On television, Ivanek is known for playing Ray Fiske on the FX series Damages (2007–2010), for which he won the 2008 Primetime Emmy for Outstanding Supporting Actor. He also appeared as Ed Danvers on Homicide: Life on the Street (1993–1999) and Russell Jackson on the CBS drama Madam Secretary (2014–2019), and has had recurring roles on series such as Oz (1997–2003), 24 (2002), True Blood (2008), Heroes (2009), Big Love (2009–2010), Banshee (2014), and 12 Monkeys (2015–2017). Since 2023, he has starred as "The Croat" on AMC's The Walking Dead: Dead City.

Ivanek was born in Ljubljana, PR Slovenia, FPR Yugoslavia,^[2] to the family of Ferdo Ivanek, originally from Varaždin, Croatia,^[3] and Vojka, née Šimić.^{[4][better source needed]} In 1960, Željko, his younger brother Ivan, and his mother immigrated to Palo Alto, California, United States, where his father was working as a research assistant at the Department of Electrical Engineering at Stanford University.^[4][5] His mother also worked at Stanford University as a project manager.^[6]

In 1962, Ivanek and his family moved back to Slovenia for five years; they returned to Palo Alto in 1967. Having performed in numerous community theater plays in the San Francisco Bay Area, Ivanek graduated from Ellwood P. Cubberley High School in Palo Alto in 1975.^[7] In 1978, Ivanek graduated from Yale University, majoring in theater. He later attended the London Academy of Music and Dramatic Art.^[8]

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Ivanek has worked extensively on the stage. In 1982, he originated the role of Hally in Athol Fugard's play "Master Harold"...and the Boys. He appeared in the U.S. premieres of Cloud Nine (for which he earned the 1981 Drama Desk Award for Outstanding Featured Actor in a Play), and The Pillowman. He performs frequently on Broadway and has been nominated for three Tony Awards for his performances in the original production of Brighton Beach Memoirs, in Two Shakespearean Actors, and in a revival of The Caine Mutiny Court-Martial, alongside David Schwimmer and Tim Daly.

However, Ivanek is perhaps best known for his supporting roles in a number of well-known television series. His first television role was as Sammie Wheaton on the soap opera The Edge of Night. Other roles include Emile Danko in Heroes; Roland in The X-Files; prosecuting attorney Ed Danvers in Homicide: Life on the Street; Ray Fiske in Damages; J.J. in Big Love; the Magister in True Blood; Governor James Devlin in Oz; Serbian terrorist Andre Drazen in 24; and Blake Sterling, the Director of National Intelligence in the NBC drama series The Event.^[9][10]

Most recently, Ivanek played Russell Jackson in the TV series Madam Secretary. He portrayed John Dickinson, the Pennsylvania representative to the Second Continental Congress, in the miniseries John Adams. He has guest-starred on such shows as Law & Order: Special Victims Unit and House. He has appeared several times on Law & Order, both as one-off characters and as Ed Danvers, this last in crossover episodes with Homicide: Life on the Street.

In addition to his stage and television work, Ivanek has appeared in more than 20 feature films, including The Sender, in which he made his feature film debut as the unnamed title character; School Ties; Black Hawk Down; In Bruges; Dogville; The Bourne Legacy; Donnie Brasco; Argo; Seven Psychopaths; and Three Billboards Outside Ebbing, Missouri.

In 2012, he portrayed Dr. Stafford White in the drama The Mob Doctor. As of 2014, he had supporting roles in several shows on broadcast and cable television, including the series Revolution, where he plays the recurring roles of Dr. Calvin Horn and an illusory nanotech avatar of Horn; Suits; Banshee; and The Americans.

In the documentary That Guy... Who Was in That Thing, Ivanek states that his contract includes a rider to ensure that the first letter in his name, Ž, has its caron properly rendered in any credits sequence where his name appears.

Ivanek has received recognition for his on-screen work. In 2008, he was awarded the Primetime Emmy Award for Outstanding Supporting Actor in a Drama Series for his performance in the role of Ray Fiske on Damages.^[11]

As of 2018, Ivanek resided in New York City with his partner, Greg Pierce. Pierce is the nephew of actor David Hyde Pierce.^[12]