Sioux was a steamship which was operated on Puget Sound and the Strait of Juan de Fuca from 1912 to 1941. From 1924 to 1941, following reconstruction, the vessel operated as an auto ferry under the name Olympic. During the Second World War (1941-1945) this vessel was taken under the control of the U.S. Army and renamed the Franklin R. Leisenburg. The Liesenburg served as a ferry in the Panama Canal area under Army control, and then was sold to a firm which ran the vessel on the Surinam river in South America.