Ian David McShane (born 29 September 1942) is an English actor. His television performances include the title role in the BBC series Lovejoy (1986, 1991–1994), Al Swearengen in Deadwood (2004–2006) and its 2019 film continuation, and Mr. Wednesday in American Gods (2017–2021). For the original series of Deadwood, McShane won the Golden Globe Award for Best Actor – Television Series Drama and received a nomination for the Primetime Emmy Award for Outstanding Lead Actor in a Drama Series. As a producer of the film, he was nominated for the Primetime Emmy Award for Outstanding Television Movie.

His film roles include Harry Brown in The Wild and the Willing (1962), Charlie Cartwright in If It's Tuesday, This Must Be Belgium (1969), Wolfe Lissner in Villain (1971), Teddy Bass in Sexy Beast (2000), Frank Powell in Hot Rod (2007), Blackbeard in Pirates of the Caribbean: On Stranger Tides (2011), and Winston Scott in the John Wick franchise (2014–present).

McShane was born in Blackburn, Lancashire on 29 September 1942. He is the child of professional footballer Harry (1920–2012) and Irene McShane (née Cowley; 1922–2020). His father was Scottish, from Holytown, Lanarkshire. His mother, who was born in England, was of Irish and English descent. McShane grew up in Davyhulme, Manchester and attended Stretford Grammar School. After being a member of the National Youth Theatre, he studied at the Royal Academy of Dramatic Art (RADA), with Anthony Hopkins and John Hurt. McShane shared a flat with Hurt, whom he called his "oldest friend in the business", and he was still a student at RADA when he appeared (with Hurt) in his first film The Wild and the Willing (1962). He later played Satan in the York Mystery Plays in 1963.

In the United Kingdom, McShane's best known role is antiques dealer Lovejoy in the eponymous series (1986, 1991–1994). Long before Lovejoy, McShane was a pin-up as a result of appearances in television series, such as Wuthering Heights (1967, as Heathcliff), Jesus of Nazareth (1977, as Judas Iscariot), and Disraeli (1978)—as well as films like Sky West and Crooked (1965), If It's Tuesday, This Must Be Belgium, Battle of Britain (both 1969), Pussycat, Pussycat, I Love You (1970), Sitting Target (1972), The Last of Sheila (1973), and The Fifth Musketeer (1979). The actor also enjoyed success in the United States as British film director Don Lockwood in Dallas.

In the United States, he is known for the role of historical figure Al Swearengen in the HBO series Deadwood, for which he won the 2005 Golden Globe Award for Best Actor in a Television Drama. He was also nominated at the 2005 Emmy Award and Screen Actors Guild Awards.

Among science fiction fans, McShane is known for playing Robert Bryson in Babylon 5: The River of Souls. In a 2004 interview with The Independent, McShane stated that he wished he had turned down the role of Bryson as he had struggled with the technical dialogue and found looking at Martin Sheen, who was wearing an eye in the middle of his forehead, to be the most embarrassing experience that he had ever had while acting.

In 1985, McShane appeared as an MC on Grace Jones' Slave to the Rhythm, a concept album which featured his narration interspersed throughout and which sold over a million copies worldwide.

In 1992, he recorded and released his own solo studio album, From Both Sides Now, which features McShane singing cover versions of popular songs. The album reached number 40 in the UK Albums Chart.