Mehnaun is a constituency of the Uttar Pradesh Legislative Assembly. It comprises the city of Khargupur and some other parts of Gonda tehsil, in Gonda district and is one of five assembly constituencies in the Gonda Lok Sabha constituency. As of 2022, it is represented by Vinay Kumar Dwivedi of the Bharatiya Janata Party.

Bharatiya Janta Party candidate Vinay Kumar Dwivedi won the 2017 Uttar Pradesh Legislative Assembly election, defeating Bahujan Samaj Party candidate Arshad Ali Khan by a margin of 36,378 votes.

27°17′N 82°10′E / 27.28°N 82.16°E / 27.28; 82.16