USS Parthenia (SP-671) was a United States Navy patrol vessel in commission from 1917 to 1919 or 1920.

Parthenia as a private yacht sometime between 1903 and 1917.
History
United States
Name	USS Parthenia
Namesake	Previous name retained
Builder	Herreshoff Manufacturing Company, Bristol, Rhode Island
Completed	1903
Acquired	Purchased 15 August 1917 Delivered 18 August 1917
Commissioned	1917
Fate	Sold 17 August 1920
Notes	Operated as private yacht Parthenia 1903-1917
General characteristics
Type	Patrol vessel
Tonnage	114 gross register tons
Length	131 ft (40 m)
Beam	18 ft (5.5 m)
Draft	7 ft 5 in (2.26 m)
Propulsion	Steam engine
Speed	13.5 knots
Complement	22
Armament	1 × 3-pounder gun 1 × machine gun

Parthenia was built as a private steam yacht of the same name by the Herreshoff Manufacturing Company at Bristol, Rhode Island, in 1903. On 15 August 1917, the U.S. Navy purchased her from Colonel Harry E. Converse for use as a section patrol vessel during World War I. Converse delivered her to the Navy on 18 August 1917, and she was commissioned as USS Parthenia (SP-671).

Parthenia performed patrol duty off the United States East Coast, apparently in New England waters, for the rest of World War I and for some time after the end of the war.

Parthenia was sold on 17 August 1920.