Will Rothhaar is an American actor. Rothhaar was born in New York City, New York, the son of Michael Rothhaar and Nancy Linehan Charles, both of whom are playwrights, actors and directors.
Rothhaar began acting in the mid 1990s, and appeared in several made-for-television films and series, including Buffy the Vampire Slayer and Mad About You. He had supporting roles in several feature films, including Jack Frost and Hearts in Atlantis. In 1999, he received the Hollywood Reporter Young Star Award for his portrayal of John in David Mamet's The Cryptogram at the Geffen Playhouse. Rothhaar's biggest role to date was the leading role in the film, Kart Racer, which received a theatrical release in September 2003. In 2004, he appeared on the series CSI: Crime Scene Investigation and had a regular role on the show Listen Up!, playing Mickey Kleinman, the son of Jason Alexander's character. He also appeared the 2005 film, Must Love Dogs. In 2011, Rothhaar appeared with Aaron Eckhart as Cpl. Lee Imlay in the alien-invasion movie Battle: Los Angeles.