USS Barbara (SP-704) was a United States Navy patrol vessel in commission from 1917 to 1918.

Barbara was built as a private motorboat of the same name in 1910 by H. H. Linnell at Dorchester, Massachusetts.

On 11 June 1917, the U.S. Navy acquired her under a free lease from her owner, Arnold Hoffman of Barrington, Rhode Island, for use as a section patrol boat during World War I.

Assigned to the section patrol in the waters around New London, Connecticut, Barbara served as a cargo and dispatch boat for the next year.

She was returned to Hoffman on 10 January 1919 and stricken from the Navy Directory the same day.