Charles Albert Hausler (January 27, 1889 – July 12, 1971) was an American architect. Over his long career he had a major impact on the built environment of Saint Paul, Minnesota. As the first person to hold the office of city architect, he designed many public buildings, including Saint Paul's three Carnegie libraries. He also designed churches, commercial buildings, and homes in a variety of styles, including Neoclassical, Prairie School, and Art Deco.