The Andrew O. Anderson House, also known as the A. O. Anderson House, is a Prairie style house in the city of DeKalb, Illinois, United States. The house was designed by American architect John S. Van Bergen around 1913 and built around 1916. Van Bergen designed many Prairie homes and was an associate of famous architect Frank Lloyd Wright. Throughout its history the Anderson House has been mistaken for a residence designed by Wright. The Anderson House contains many elements common to both Prairie style in general as well as some of Wright's early Prairie designs. The house was constructed for DeKalb clothing merchant Andrew O.