USS Sotoyomo (ATR-43/ATA-121) was a rescue tug of the United States Navy that served during World War II and the early 1950s, and was sold to Mexico in 1963.

The ship was laid down on 7 September 1942 at Orange, Texas, by the Levingston Shipbuilding Co., launched on 19 October 1942, and commissioned on 29 May 1943 as USS ATR-43.

In June 1943, ATR-43 sailed from Orange; proceeded via New Orleans and Key West to Hampton Roads; and arrived at Norfolk, Virginia on the 29th.

On 21 July, after shakedown exercises and eight days in drydock at the Norfolk Navy Yard, ATR-43 headed back to Key West.

On Independence Day 1945, she sailed for Eniwetok Atoll with the barracks craft APL-2, floating workshop YR-61, and harbor tug YTL-550 in tow.