Menghai County (; Tai Lue: Meng Haai; ) is a county under the jurisdiction of Xishuangbanna Dai Autonomous Prefecture, in the far south of Yunnan, China, bordering Burma's Shan State to the south and west. Meng is as variation of Mueang.
Menghai County is in the west of Xishuangbanna Dai Autonomous Prefecture in southwestern Yunnan. It borders Jinghong to the east, Simao District to the northeast, Lancang County to the northwest and Myanmar (Shan State) to the south and west.
In and around Menghai County, ethnic Hani subgroups include:
Menghai County has 6 towns, 2 townships and 3 ethnic townships.
Menghai is famous for its Bulang tea, a type of pu-erh grown in the Bulang Mountain area and its environs. Famous plantations include Laoman'e, Xinbanzhang and Laobanzhang.