SS Hellas Liberty is a Liberty ship built in the United States during World War II.

From delivery on 18 December 1943 the ship was operated by an agent for the War Shipping Administration until laid up September 1945 with a brief operating period in 1947. Between October 1947 and February 1956 the ship was in long term layup. In 1956 Hellas Liberty began operations as a cable transport for the American Telephone and Telegraph Company (AT&T).

The Historic American Engineering Record for the ship notes significance as an existing Liberty ship example and role in Operation PLUTO (pipeline-under-the-sea) and later work as a cable transport for AT&T communications cable installations and then for installation of the Sound Surveillance System (SOSUS) until 1983. In 2009 Hellas Liberty (Arthur M. Huddel) was donated to Greece to serves as the museum ship Hellas Liberty. The fully restored ship is on display in the Port of Piraeus, Athens.

Greece
Name	Hellas Liberty
Acquired	2008
Identification	IMO number: 5025706
Status	Converted to a museum ship
General characteristics [3]
Class and type	Liberty ship type EC2-S-C1, standard
Tonnage	10,865 LT DWT 7,176 GRT
Displacement	3,380 long tons (3,434 t) (light) 14,245 long tons (14,474 t) (max)
Length	441 feet 6 inches (135 m) oa 416 feet (127 m) pp 427 feet (130 m) lwl
Beam	57 feet (17 m)
Draft	27 ft 9.25 in (8.4646 m)
Installed power	2 × Oil fired 450 °F (232 °C) boilers, operating at 220 psi (1,500 kPa) 2,500 hp (1,900 kW)
Propulsion	1 × triple-expansion steam engine, (manufactured by Filer and Stowell, Milwaukee, Wisconsin) 1 × screw propeller
Speed	11.5 knots (21.3 km/h; 13.2 mph)
Capacity	562,608 cubic feet (15,931 m3) (grain) 499,573 cubic feet (14,146 m3) (bale)
Complement	38–62 USMM 21–40 USNAG
Armament	Varied by ship Bow-mounted 3 inches (76 mm)/50 caliber gun Stern-mounted 4 inches (102 mm)/50 caliber gun 2–8 × single 20 millimeters (0.79 in) Oerlikon anti-aircraft (AA) cannons and/or, 2–8 × 37 millimeters (1.46 in) M1 AA guns