Kevin Chamberlin (born November 25, 1963^[3]) is an American actor. He is known for his theatre roles such as Horton in Seussical and Uncle Fester in The Addams Family. For his theatre work, he was nominated for three Tony Awards and three Drama Desk Awards. He also starred as Bertram Winkle in the Disney Channel Original Series sitcom Jessie from 2011 to 2015. From 2018 to 2019, he starred as The Wizard of Oz in Wicked on Broadway.

Chamberlin was born on November 25, 1963 in Baltimore, Maryland,^[3] and was raised in Moorestown, New Jersey. In elementary school, he starred as Huck Finn in the school's production of Tom Sawyer. After he graduated from Moorestown High School in 1981,^[4] Chamberlin studied acting at Rutgers University's Mason Gross School of the Arts in New Brunswick, New Jersey, and graduated with a B.F.A. in acting in 1985.^[5] Chamberlin has since acted on Broadway, having been nominated for three Tony Awards,^[6] and has an extensive list of film^[7] and television credits.

Chamberlin is gay.^[8] He has been married to TV writer and producer Michael Gans since 2008, having been together since 1991.^[9][10]

Chamberlin made his Broadway debut in 1992 in My Favorite Year ^[11] Chamberlin has been nominated for Drama Desk and Tony Awards for Dirty Blonde (as Charlie), Seussical (as Horton), and The Addams Family (as Uncle Fester). Additional Broadway theatre credits include Triumph of Love, Abe Lincoln in Illinois, Chicago, The Ritz and Wicked.

He appeared in the 1999 film Trick. He also appeared in Die Hard with a Vengeance as an enthusiastic NYPD bomb defusal expert. In Lucky Number Slevin, he again had a supporting role as a New York police officer. Chamberlin's most recent work includes the role of Aron Malsky in the NBC prime-time series Heroes. He also made an appearance in a Law and Order: Special Victims Unit episode titled "Redemption" where he played a man named Roger Berry. He was also a guest on the sitcom Frasier, in season 10 episode 13. Chamberlin previously appeared as Uncle Fester in the musical The Addams Family, a role for which he won a Broadway.com Audience Award for Favorite Performance By a Featured Actor In a Broadway Musical.^[12] Brad Oscar replaced him in the role of Uncle Fester on March 8, 2011.^[13] Chamberlin also starred as Dr. Fusion in Teen Beach Movie, a Disney Channel Original Movie starring Ross Lynch, Maia Mitchell, Barry Bostwick, and Steve Valentine which aired July 19, 2013.

In 2019, Chamberlin appeared as Mr. Mushnik in the Pasadena Playhouse production of Little Shop of Horrors alongside George Salazar, Mj Rodriguez, Amber Riley and Matthew Wilkas.^[14]

In 2020, Chamberlin was one of the many TikTok users who created an internet meme of a musical version of the 2007 Disney/Pixar film Ratatouille. On December 28, 2020, it was announced that Chamberlin would star as Gusteau in a benefit concert presentation of the musical. The concert streamed exclusively on TodayTix on January 1, 2021.^[15]

In 2022, Chamberlin appeared as Nicely-Nicely Johnson in Guys and Dolls at the Kennedy Center. He starred opposite James Monroe Iglehart, Jessie Mueller, Steven Pasquale, and Phillipa Soo.^[16] Chamberlin received a Helen Hayes Award for his performance.^[17]