Roncalli High School is a private, Catholic high school located in Manitowoc, Wisconsin, USA. It is owned by the Diocese of Green Bay. Founded in 1965, Roncalli High School is named for Pope John XXIII. Roncalli offers a college-prep curriculum. The school's mascot is the Jets, and its gymnasium is known as "the Hangar". A Fine Arts Center for the visual and performing arts is the newest addition.