USS Taniwha (SP-129) was an armed yacht that served in the United States Navy as a patrol vessel from 1917 to 1919. Taniwha was built as a civilian yacht in 1909 by the George Lawley & Son at Neponset, Massachusetts. The U.S. Navy acquired Taniwha under a free lease from her owner, Mr. Henry B. Anderson of New York City, for use as a patrol boat during World War I and commissioned the same day as USS Taniwha (SP-129). The date of her de facto acquisition and commissioning is reported both as 14 May 1917 and as 18 May 1917, although the Navy did not formalize her acquisition from Anderson until several months later, on 29 September 1917.