USS Sioux (AT-75) was a Navajo-class fleet tug of the United States Navy that saw service during World War II, and in the Korean and Vietnam Wars. The ship was laid down on 14 February 1942 by United Engineering Co. of San Francisco, California, at Mare Island Navy Yard. Sioux was launched on 27 May 1942 sponsored by Mrs. Evelyn H. Sims of Jefferson, Texas, the mother of five sons serving in the Navy. USS Sioux commissioned on 6 December 1942, Lt (jg.) L. M. Jahnsen in command.