Möng Nai, also known as Mone, was a Shan state in what is today Burma. It belonged to the Eastern Division of the Southern Shan States. Its capital was the town of Möng Nai.
Möng Nai was founded in 1223 or 1318. Northern Thai chronicles claim that the state was founded in 1318 by Khun Khüa, a son of Mangrai, and ruled as a vassal state of Lan Na in the coming centuries. However, Shan histories claim that it was conquered by Sam Long Hpa in 1223, and a branch of the "old Möng Mi line" were put in charge of the state as tributaries of Möng Mao. The native records of the state were lost in various fires.
The state's ritual name was Saturambha.
In later centuries, Möng Nai included the substates of Kengtawng and Kenghkam. The latter was annexed in 1882.
Ritual style Kambawsa Rahta Mahawunthiri Pawara Thudamaraza.