Dinea Island (, ) is the flat rocky island off the north coast of Greenwich Island in the South Shetland Islands extending 290 m in north-northwest to south-southeast direction and 130 m wide. The area was visited by early 19th century sealers.
The island is named after the ancient Roman fortress of Dinea in Northeastern Bulgaria.
Dinea Island is located at , which is 1.35 km west-northwest of Aprilov Point, 840 m east-northeast of Miletich Point, 880 m east of Kabile Island and 2 km southwest of Ongley Island. Bulgarian mapping in 2009.