USS Merganser may refer to the following ships of the United States Navy:

  • USS Merganser (AM-135), was originally the commercial trawler Annapolis acquired by the US Navy 3 January 1942 and decommissioned 1 May 1944
  • USS Merganser (AM-405), would have been a minesweeper but the contract for her construction was canceled 12 August 1945
  • USS Merganser (AMS-26), was launched as YMS-417 29 June 1944, redesignated AMS‑26 and named Merganser 17 February 1947 and decommissioned 2 April 1958.

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