John C. Reilly (born May 24, 1965) is an American actor and comedian, celebrated for his remarkable versatility.

He began his film career with intense dramatic roles in films by Paul Thomas Anderson (such as *Hard Eight*, *Boogie Nights*, and *Magnolia*) and Martin Scorsese (*Gangs of New York*, *The Aviator*). He received an Academy Award nomination for Best Supporting Actor for the musical *Chicago* (2002).

His filmography spans from drama to comedy, often portraying characters who are good-natured, sometimes naive or clumsy, but also profound and vulnerable. He is particularly known for his comedic collaborations with Will Ferrell in films such as *Talladega Nights: The Ballad of Ricky Bobby* (2006) and *Step Brothers* (2008), and for his starring role in *Walk Hard: The Dewey Cox Story* (2007). He has also found success in voice acting, lending his voice to the protagonist of *Wreck-It Ralph* (2012) and its sequel.