Katahariya (Maithili: कटहरिया) is a municipality in Rautahat District in the Narayani Zone of south-eastern Nepal.

Katahariya is a fast-growing municipality, with the main occupations of local people being business and farming.

Katahariya became a municipality since September 2017 by merging different Gaupalika (previously VDCs) such as Hathiyahi, Birti Prastoka, Bhasedhawa, Bagahi, Balirampur, Pipra Pokhariya.

In the recent local level election conducted on 13 May 2022, Ajay Prakash Jaiswal from Nepali Congress became the mayor however After the corruption case was filed by the authority, Mayor Ajay Prakash Jaiswal was suspended alone with 4 other board members since 04 June 2024.

[2] Katahariya PHCC,with 24 hour Emergency Service Other cellular networks available are UTL Nepal and Smart Cell.