Sugauli is a city and a notified area in East Champaran district in the Indian state of Bihar. It is the setting for Rudyard Kipling's story "Rikki-Tikki-Tavi", and the place where a treaty was signed with Nepal in 1816.

The Treaty of Sugauli, the treaty that established the boundary line of Nepal, was signed on 4 March 1816 between the East India Company and Guru Gajraj Mishra following the Anglo-Nepalese War of 1814–16.