USS Achigan (YT-218/YTB-218) was a Cahto-class large harbor tug in the service of the United States Navy. She was laid down as Achigan (YT-218) on 23 July 1943 at Ipswich, Massachusetts by W. A. Robinson, reclassified YTB-218 on 15 May 1944, launched on 4 October 1944, and placed in service on 9 January 1945.