Alan Cumming (born 27 January 1965) is a Scottish actor, writer and presenter. Known for his roles on stage and screen, he has received numerous accolades, including a BAFTA Award, two Emmy Awards, two Tony Awards, and an Olivier Award. He received the Laurence Olivier Award for Best Comedy Performance for the West End production of Accidental Death of an Anarchist (1991). His other Olivier-nominated roles were in The Conquest of the South Pole (1988), La Bête (1992), and Cabaret (1994). Cumming won the Tony Award for Best Actor in a Musical for reprising his role as the Emcee on Broadway in Cabaret (1998). His other performances on Broadway include Design for Living (2001) and Macbeth (2013).

Cumming is known for his film roles in Circle of Friends (1995), GoldenEye (1995), Emma (1996), Romy and Michele's High School Reunion (1997), Buddy (1997), Spice World (1997), Eyes Wide Shut (1999), Nicholas Nickleby (2002), The Tempest (2010), Burlesque (2010), and Battle of the Sexes (2017). He is also known for his roles as Fegan Floop in the Spy Kids trilogy (2001–2003), Nightcrawler in X2 (2003), and Loki in Son of the Mask (2005).

On television, Cumming is best known for his role in the CBS series The Good Wife (2010–2016), for which he was nominated for three Primetime Emmy Awards, two Screen Actors Guild Awards, and two Golden Globe Awards. Cumming also starred in the CBS series Instinct (2018–2019), the Apple TV+ series Schmigadoon! (2021–2023) and presents the Peacock reality game show The Traitors. Cumming has written a novel, Tommy's Tale (2002), and two memoirs in 2014 and 2019.