USNS Shearwater (T-AG-177) was a Shearwater-class miscellaneous auxiliary built during the final months of World War II for the US Army as FS-411 (Design 381 coastal freighter) by Hickinbotham Brothers Shipbuilders.

FS-411 was Coast Guard manned operating in the Central and Western Pacific, including Hawaii, Saipan, Tinian, Guam, during the closing days of the war.

Shearwater began her naval service as a survey support ship with the Military Sea Transportation Service in May 1964.

Operated by a Civil Service crew, she operated in the Atlantic Ocean until mid-February 1969, when she was transferred back to the U.S. Army.

As of 2007, Shearwater was active as a fishing vessel based at Reedville, Virginia.