Daniel Day-Lewis (born 29 April 1957) is a retired actor of British and Irish citizenship. Often described as one of the greatest actors in the history of cinema, he received numerous accolades throughout his career which spanned over four decades, including three Academy Awards, four BAFTA Awards, three Screen Actors Guild Awards and two Golden Globe Awards.

The actor excelled on stage at the National Youth Theatre before being accepted at the Bristol Old Vic Theatre School, which he attended for three years. Despite his traditional training at the Bristol Old Vic, he is considered a method actor, known for his constant devotion to and research of his roles. Protective of his private life, he rarely grants interviews, and makes very few public appearances.

Day-Lewis shifted between theatre and film for most of the early 1980s, joining the Royal Shakespeare Company and playing Romeo Montague in Romeo and Juliet and Flute in A Midsummer Night's Dream. Playing the title role in Hamlet at the National Theatre in London in 1989, he left the stage midway through a performance after breaking down during a scene where the ghost of Hamlet's father appears before him—this was his last appearance on the stage. After supporting film roles in Gandhi (1982), and The Bounty (1984), he earned acclaim for his breakthrough performances in My Beautiful Laundrette (1985), A Room with a View (1985), and The Unbearable Lightness of Being (1988).

He earned Academy Awards for his roles in My Left Foot (1989), There Will Be Blood (2007), and Lincoln (2012). His other Oscar-nominated roles were in In the Name of the Father (1993), Gangs of New York (2002), and Phantom Thread (2017). Other notable films include The Last of the Mohicans (1992), The Age of Innocence (1993), The Crucible (1996), and The Boxer (1997). He retired from acting from 1997 to 2000, taking up a new profession as an apprentice shoe-maker in Italy. Although he returned to acting, he announced his retirement again in 2017.