Oro Bay is a bay in Oro Province, Papua New Guinea, located 15 miles (24 km) southeast of Buna. The bay is located within the larger Dyke Ackland Bay. A port is operated by PNG Ports Corporation Limited with limited wharf facilities.[1]
During World War II, Oro Bay was used as staging area for the battle of Buna-Gona and future operations. A United States advanced base was constructed at Oro Bay, with a liberty ship wharf at the southern end of the bay, installations along the shore, and anti-aircraft gun batteries in the surrounding hills.[2] On 28 March 1943, Imperial Japanese planes attacked shipping and harbour facilities at Oro Bay, resulting in the sinking of SS Masaya and SS Bantam.