Manghai () is a town in Mangshi, Yunnan, China. As of the 2017 census it had a population of 6,777 and an area of . It is surrounded by Zhefang Town on the northwest, Mengga Town and Dongshan Township on the east, and Myanmar on the south.
As of December 2015, the town is divided into 3 villages:
The town has a subtropical climate with an annual rainfall of , a long sunshine time and an annual average temperature of . The highest elevation is and the lowest is .
The economy is supported primarily by farming, ranching and frontier trade. The traditional industries are rice, tea, sugarcane, animal husbandry and tsao-ko. The emerging industries are walnut, coffee, macadamia nut and bamboo industry.
The National Highway G320 passes across the town.