The Rialto Square Theatre is a theater in Joliet, Illinois (U.S.). Opening in 1926, it was originally designed and operated as a vaudeville movie palace, but it now houses mainly musicals, plays, concerts, and standup comedy. It is also available for public and private functions. Designed in the Neo-Baroque style, it is considered one of "150 great places in Illinois" by the American Institute of Architects.