Iowa City’s Resident Professional Theatre. Riverside Theatre is a professional, non-profit theatre company based in Iowa City. It produces a year-round season of work ranging from new and contemporary plays to the classics. It's Gilbert St. Theatre is an intimate 118 seats. Currently in its 33nd season, Riverside Theatre strives to connect artists and audiences through intimate, engaging and provocative productions. As a result, it has produced numerous world premieres, regional premieres, classics of world theatre and tours that include The National Archives and The Smithsonian Institute. Riverside Theatre continues to provide diverse programming that includes new and challenging artistic experiences for both its artists and audiences. For information about our current season, call the box office or visit our website.