Katahari Gaupalika rural municipality (), established in 2017, is a Gaupalika (rural municipality) located in the Morang District of the Kosi Zone in Province No. 1 of Nepal.
Katahari, Thalaha and Bhaudaha VDCs were incorporated into Katahari Gaupalika.
This rural municipality has an area of 51.59 km<sup>2</sup>. The population as of 2017 is 39,775.
The office of the Katahari Gaupalika rural municipality is in the town of Katahari, where the former Village development committeeâÂÂVDC office was also.