Walter Bruce Willis (born March 19, 1955) is a retired American actor. He achieved fame with a leading role on the comedy-drama series Moonlighting (1985–1989) and appeared in over a hundred films, gaining recognition as an action hero after his portrayal of John McClane in the Die Hard franchise (1988–2013) and other roles.

Willis's other credits include The Last Boy Scout (1991), Death Becomes Her (1992), Pulp Fiction (1994), 12 Monkeys (1995), The Fifth Element (1997), Armageddon (1998), The Sixth Sense (1999), Unbreakable (2000), Sin City (2005), Red (2010), Moonrise Kingdom (2012), Looper (2012) and Red 2 (2013). In the later years of his career, Willis starred in many low-budget direct-to-video films, which were poorly received. In March 2022, Willis's family announced that he was retiring after suffering from aphasia. In February 2023, he was diagnosed with frontotemporal dementia.

As a singer, Willis released his debut album, The Return of Bruno, in 1987, followed by two more albums in 1989 and 2001. He made his Broadway debut in the stage adaptation of Misery in 2015. Willis has received various accolades throughout his career, including a Golden Globe Award, two Primetime Emmy Awards, and two People's Choice Awards. He received a star on the Hollywood Walk of Fame in 2006. Films featuring Willis have grossed between US$2.64 billion and US$3.05 billion at North American box offices, making him in 2010 the eighth-highest-grossing leading actor.