Xinghai County (Chinese: 兴海县; Tibetan: བྲག་དཀར་རྫོང་།) is a county under the jurisdiction of Hainan Tibetan Autonomous Prefecture, in the east-central part of Qinghai Province, China.

Xinghai has an area of 13,158 km2 (5,080 sq mi), and a 2001 population of 60,000.

Xinghai is made up of 3 towns, and 4 townships.