John E. "Jack" Noseworthy, Jr. is an American actor, whose most visible movie roles were in Event Horizon, U-571, and Killing Kennedy.
He graduated from Lynn English High School in 1982 and attended Boston Conservatory, where he earned a BFA. He appeared in Bon Jovi's music video "Always", with Carla Gugino and Keri Russell. He co-starred with Meryl Streep in the Public Theater's 2006 production of Mother Courage and Her Children.
He starred in a short-lived MTV drama series, Dead at 21. In December 2005, he originated the role of Armand in the musical Lestat during its pre-Broadway run at the Curran Theatre in San Francisco, but left the production during its first week of previews. He is also the only male actor to play Peter Pan in the musical adaptation.
Noseworthy made his debut as a nightclub performer in September 2006 at the Metropolitan Room in New York City in "You Don't Know Jack!". He appeared in a Burbank musical at the Colony Theater, No Way To Treat A Lady, a musical version of the cult film of the same name, written by Douglas J. Cohen, which opened on April 18, 2009.