The Clinton Street Theater is a theater located in southeast Portland in the U.S. state of Oregon. It is believed to be one of the oldest continually operating cinemas in the United States. The theater was built in 1914 and opened as The Clinton in 1915. The venue became known as the 26th Avenue Theatre in 1945 and the Encore in 1969, before reverting to a resemblance of its original name in 1976. The Clinton often screens grindhouse, cult and experimental films, and has become known for hosting regular screenings of The Rocky Horror Picture Show (since 1978, marking one of the film's longest-running showings) and Repo! The Genetic Opera. The venue also hosts the annual Filmed by Bike festival, the Faux Film Festival and the Portland Queer Documentary Film Festival.