Oscar Wenderoth (1871–1938) was an American architect who served as director of the Office of the Supervising Architect from 1912 to 1915. He is identified as the architect of many government buildings built during that period, including some listed on the National Register of Historic Places. He was appointed to the directorship by President William Howard Taft in 1912. He resigned in 1915 without providing a public explanation of his resignation. Later in his career he also worked for Weary & Alford.