| Katahariya | |
| Native Name: | कटहरिया |
| Native Name Lang: | mai |
| Settlement Type: | Municipality |
| Pushpin Map: | Nepal |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Nepal |
| Pushpin Label Position: | bottom |
| Coordinates: | 26.97°N 85.21°W |
| Subdivision Type: | Country |
| Subdivision Name: | Nepal |
| Subdivision Type1: | Development Region |
| Subdivision Type2: | Zone |
| Subdivision Type3: | District |
| Subdivision Type4: | Province |
| Subdivision Name1: | Central |
| Subdivision Name2: | Narayani |
| Subdivision Name3: | Rautahat |
| Subdivision Name4: | Province No. 2 |
| Leader Title: | Mayor |
| Leader Name: | Ajay Prakash Jaiswal |
| Leader Title1: | Deputy Mayor |
| Leader Name1: | Rita Devi Yadav |
| Established Date: | 2016 A.D. (2073 B.S.) |
| Area Total Km2: | 40.69 |
| Population Total: | 38,513 |
| Population As Of: | 2011 |
| Population Footnotes: | [1] |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Population Blank2: | Hindu, Muslim, |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Local |
| Postal Code Type: | Postal Code |
| Postal Code: | 44500 |
| Area Code: | 055 |
| Website: | www.katahariyamun.gov.np |
| Timezone: | NST |
| Utc Offset: | +5:45 |
| Demographics1 Info1: | Maithili, Tharu, Nepali |
Katahariya (Maithili: कटहरिया) is a municipality in Rautahat District in the Narayani Zone of south-eastern Nepal. Before September 2017, Katahariya was one of the Village Development Committees (VDC) with 8 wards. At the time of the 1991 Nepal census, it had a population of 4,619 people living in 835 individual households. Katahariya is famous for its unique moton dish. A well known moton dish named “Katiya : कटिया” is origin from Katahariya Bazar. It has a well-maintained Farmers' market (vegetable) and Cattle (domestic-animal) market. 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. Currently, there are 9 wards in this municipality. 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.