The Waldo Theatre is a historic movie theater and performance venue at 916 Main Street in Waldoboro, Maine. Built in 1936 as a movie theater to a design by New York City architect Benjamin Schlanger, it was hailed at the time as one of the best-designed state-of-the-art small theaters in the country. It is now managed by a non-profit arts organization. It was listed on the National Register of Historic Places in 1986.