Jonah Hill (born Jonah Hill Feldstein; December 20, 1983) is an American actor. Hill ranked 28th on Forbes's list of highest-paid actors from June 2014 to June 2015, at $16 million. Among his accolades are nominations for two Academy Awards, a BAFTA Award, and two Golden Globe Awards.

Hill had comedic roles in films including The 40-Year-Old Virgin (2005), Knocked Up (2007), Superbad (2007), Get Him to the Greek (2010), 21 Jump Street (2012), This Is the End (2013), and 22 Jump Street (2014). For his performances in Moneyball (2011) and The Wolf of Wall Street (2013), he was nominated for the Academy Award for Best Supporting Actor. He also had roles in Cyrus (2010), War Dogs (2016), Don't Worry, He Won't Get Far on Foot (2018), and Don't Look Up (2021).

Hill voiced characters in the animated films Horton Hears a Who! (2008), How to Train Your Dragon franchise (2010–2019), Megamind (2010), The Lego Movie franchise (2014–2019), and Sausage Party (2016). As a screenwriter, he contributed to the stories of 21 Jump Street, 22 Jump Street, Sausage Party, Why Him? (2016), and You People (2023). He starred in the Netflix miniseries Maniac (2018) and made his directorial debut with the film Mid90s (2018), for which he also wrote the screenplay. He directed and produced the documentary Stutz (2022).

Hill was born on December 20, 1983, in Los Angeles, California. His parents are Sharon Lyn (née Chalkin), a costume designer and fashion stylist, and Richard Feldstein, a tour accountant for Guns N' Roses. He has a younger sister, actress Beanie Feldstein (b. 1993). Their older brother, Jordan Feldstein (1977–2017), was a music manager for Robin Thicke and Maroon 5 until his sudden death at age 40 from a pulmonary embolism. Their parents were originally from Long Island, New York, and the family vacationed in the Catskill Mountains.

Hill and his siblings were raised in the wealthy Los Angeles neighborhood of Cheviot Hills, where he continues to reside, and attended the Center for Early Education, Brentwood School, and then Crossroads School in Santa Monica. He worked at Hot Rod Skateboard Shop on Westwood Boulevard in Los Angeles. After graduating from high school in 2002, he attended The New School, Bard College and the University of Colorado Boulder, but did not earn a degree.

Hill is Jewish and had a bar mitzvah ceremony.

In college, Hill began writing his own plays and performing them in the Black and White bar in the East Village neighborhood of New York City. His plays developed a small following and helped him realize that his true desire was to act in films. He was befriended by Dustin Hoffman's children, Rebecca and Jake, who introduced him to their father. The elder Hoffman asked him to audition for a role in I Heart Huckabees, in which Hill made his film debut.

Hill then made a brief appearance in Judd Apatow's directorial debut, The 40-Year-Old Virgin, which led to his appearing in the role of a virgin video game tester in the comedy Grandma's Boy (2006), and roles in the comedies Accepted and Click, playing Adam Sandler's character's son in the latter. He had a larger supporting role in the Apatow-directed Knocked Up (2007). On television he played the "RA Guy" on the first season of the Oxygen Network sitcom Campus Ladies, and guest-starred in an episode of Clark and Michael.