William Francis Nighy (/naɪ/; born 12 December 1949) is a British actor. Known for his work on stage and screen, he has received various accolades, including two BAFTA Awards and a Golden Globe Award, in addition to nominations for an Academy Award, a Tony Award, a Laurence Olivier Award and two Screen Actors Guild Awards.

Nighy started his career with the Everyman Theatre, Liverpool, and made his London debut with the Royal National Theatre, starting with The Illuminatus! in 1977. He gained acclaim for his roles in David Hare's Pravda in 1985, Harold Pinter's Betrayal in 1991, Tom Stoppard's Arcadia in 1993, and Anton Chekhov's The Seagull in 1994. He received a Laurence Olivier Award for Best Actor nomination for his role in Blue/Orange in 2001. He acted on Broadway in the David Hare plays The Vertical Hour (2006) and Skylight (2015), earning a Tony Award for Best Actor in a Play nomination for the latter.