USS Cozy (SP-556) was a United States Navy patrol vessel in commission from 1917 to 1918.

Cozy as a civilian motorboat prior to her United States Navy service.
History
United States
Name	USS Cozy
Namesake	Previous name retained
Builder	L. P. Trader
Acquired	15 November 1917
Commissioned	30 November 1917
Decommissioned	December 1918
Fate	Returned to owner 20 December 1918
Notes	Operated as civilian motorboat Cozy until November 1917 and from December 1918
General characteristics
Type	Patrol vessel
Tonnage	12 gross register tons
Length	35 ft (11 m)[1] or 50 ft (15 m)[2]
Beam	8 ft 6 in (2.59 m)
Draft	3 ft (0.91 m)
Speed	8 knots
Complement	6
Armament	1 × machine gun 1 × Y-gun

Cozy was built as a wooden-hulled civilian working motorboat of the same name by L. P. Trader. On 15 November 1917, the U.S. Navy chartered her from her owner, Harry N. Collins of Franklin City, Virginia, for use as a section patrol vessel during World War I. She was commissioned as USS Cozy (SP-556) on 30 November 1917.

Assigned to the 5th Naval District, Cozy served on patrol duties for the rest of World War I.

Cozy was decommissioned in December 1918 and returned to Collins on 20 December 1918.