USS Nelansu (SP-610) was a United States Navy patrol vessel in commission from 1917 to 1918.

Nelansu was built as a private motorboat by R. Bigelow at Monument Beach, Massachusetts. Some sources say her original name was U. S. Kent,NavSource Online: Section Patrol Craft Photo Archive Nelansu (SP 610) states this as a certainty, while says both that it was a certainty and a possibility. while others state that this only was a possibility, states that it was both a possibility and a certainty but all agree that she was named Nelansu by 1917.

In 1917, the U.S. Navy acquired her under a free lease from her owner, John S. Kent, for use as a section patrol boat during World War I, and she was commissioned as USS Nelansu (SP-610). Sources disagree on the timing of these events, claiming acquisition dates of both 26 MayNavSource Online: Section Patrol Craft Photo Archive Kiowa (SP 711) claims she was acquired on 26 May 1917. and 20 JulyDictionary of American Naval Fighting Ships at . 1917; the only source to provide a commissioning date places it on 26 May 1917.Department of the Navy Naval History and Heritage Command Online Library of Selected Images: U.S. Navy Ships: USS Kiowa (SP-711), 1917–1919. Later renamed SP-711 claims Nelansu was commissioned on 26 May 1917.

Assigned to the 1st Naval District in northern New England, Kiowa carried out patrol duties in the Boston, Massachusetts, area for the rest of World War I.

Nelansu was decommissioned on 30 November 1918 and returned to Kent the same day.

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