SS Supetar was a Yugoslavian Cargo ship that was torpedoed and sunk by the Japanese submarine I-16 on 12 June 1942 in the Indian Ocean, 100 nautical miles (190 km) south of Beira, Mozambique.^[1]

Supetar was built at the William Gray & Co. Ltd. shipyard in West Hartlepool, County Durham, North East England in 1909. Where she was launched and completed that same year. The ship was 111.1 metres (364 ft 6 in) long, had a beam of 15.5 metres (50 ft 10 in) and a depth of 7 metres (23 ft 0 in). She was assessed at 3,748 GRT and had 1 x 3-cyl. triple expansion engine driving a single screw propeller. The ship could reach a maximum speed of 8.5 knots.^[1]

Supetar was torpedoed and sunk by the Japanese submarine I-16 on 12 June 1942 in the Indian Ocean, 100 nautical miles (190 km) south of Beira, Mozambique. All crew on board at the time of the sinking survived.^[1]