The second USS Viking (SP-3314) was a United States Navy patrol vessel in service from 1918 to 1919.

Viking was built in 1915 as the motorboat Caesar by the U.S. Navy and sold to civilian owner soon afterwards without seeing any naval service.

On 5 September 1918, the U.S. Navy inspected Viking for possible naval service, and on 24 September 1918 acquired her from her owner, Mrs. E. S. Wood, for use as a section patrol boat during World War I.

Assigned to the 5th Naval District, Viking operated in the vicinity of Norfolk, presumably on patrol duties, at least through the end of World War I.

On 2 February 1919, the United States Secretary of the Navy authorized the Commandant of the 5th Naval District to dispose of Viking as junk.