John Christopher Reilly (born May 24, 1965) is an American actor. A character actor, he is known for leading and supporting roles in both independent films and major studio features. The recipient of various accolades, Reilly is one of only two people to have been nominated for an Emmy Award, a Grammy Award, an Academy Award, and a Tony Award (EGOT) without winning any.

Reilly started his career in the late 1980s, gaining recognition for his supporting roles in Casualties of War (1989), Days of Thunder (1990), Hard Eight(1996), Boogie Nights (1997), Magnolia (1999), Gangs of New York (2002) and The Aviator (2004). For his performance in the musical film Chicago (2002), he received nominations for the Academy Award and the Golden Globe Award for Best Supporting Actor.