Paul Stephen Rudd (born April 6, 1969) is an American actor. He studied theater at the University of Kansas and the American Academy of Dramatic Arts, before making his acting debut in 1991. He received a star on the Hollywood Walk of Fame in July 2015. He was included on the Forbes Celebrity 100 list in 2019. In 2021, he was named People magazine's "Sexiest Man Alive".

His films include Clueless (1995), Halloween: The Curse of Michael Myers (1995), Romeo + Juliet (1996), Wet Hot American Summer (2001), Anchorman: The Legend of Ron Burgundy (2004), The 40-Year-Old Virgin (2005), Knocked Up (2007), I Love You Man (2009), This Is 40 (2012), and Ghostbusters: Afterlife (2021). He has played Ant-Man in the Marvel Cinematic Universe, beginning with Ant-Man (2015) and most recently appearing in Ant-Man and the Wasp: Quantumania (2023).

In addition to his film career, Rudd has appeared in numerous television shows, including the NBC sitcom Friends as Mike Hannigan, along with guest roles on Tim and Eric Awesome Show, Great Job!, Reno 911! and Parks and Recreation, and has also hosted Saturday Night Live multiple times. He starred in a dual role in the Netflix comedy series Living with Yourself, which earned him a Golden Globe Award nomination for Best Actor – Television Series Musical or Comedy. He starred in the miniseries The Shrink Next Door (2021).