Eliot Butler Willauer, AIA, (April 4, 1912 – February 6, 1972) was an American architect active in mid-twentieth-century New York City. With William G. Tachau, he was a principal in the architectural firm of Tachau & Vought, the successor firm to Pitcher & Tachau. The firm, located on 102 East 30th Street around 1923, specialized in mental hygiene hospitals. He went on to a career as an associate with the firm of Eggers & Higgins.