The Theodore A. Pappas House is a Frank Lloyd Wright designed Usonian house in St. Louis, Missouri. The Pappas house was listed on the National Register of Historic Places in 1979, when it was only 15 years old. It is one of two houses in St. Louis designed by Wright, and the only Usonian Automatic in Missouri. Wright designed it between 1955 and 1959 at the Pappas’ request, and Theodore and Bette Pappas built the house together with the help of day laborers between 1960 and 1964. The Pappas house is a rambling four-bedroom house, and after the Gerald B. and Beverley Tonkens House, is the largest of the Usonian Automatics built.