USS Helena I (SP-24) was an armed yacht that served the United States Navy as a patrol vessel from 1917 to 1919.

Helena I was built in 1906 by the Van Sant Brothers, Port Republic, New Jersey, as a private motor yacht.

The U.S. Navy acquired her from Dr. W. G. Hall of Trenton, New Jersey, in May 1917 for World War I service.

Assigned to the 7th Naval District, she was taken to Key West, Florida, and commissioned as the USS Helena I (SP-24) on 7 September 1917.

Helena I operated as a harbor and coastal patrol boat in the vicinity of Key West, until decommissioned and sold on 27 August 1919.