| Karajanha Municipality | |
| Native Name: | कर्जन्हा नगरपालिका |
| Settlement Type: | Municipality |
| Pushpin Map: | Nepal |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Nepal |
| Subdivision Type: | Country |
| Subdivision Name: |  Nepal |
| Subdivision Type1: | Province |
| Subdivision Name1: | Madhesh Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Siraha District |
| Government Type: | Local development |
| Leader Title: | Mayor |
| Leader Name: | Bhola Pokharel |
| Leader Title1: | Deputy Mayor |
| Leader Name1: | Laxmi Kumari Shrestha |
| Population As Of: | 1991 |
| Population Total: | 5296 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Timezone: | Nepal Time |
| Utc Offset: | +5:45 |
| Coordinates: | 26.86°N 86.22°W |
| Website: | http://www.karjanhamun.gov.np/ |
Karjanha is a Municipality in Siraha District in the Madhesh Province of East of Nepal. At the time of the 1991 Nepal census it had a population of 5296 people living in 954 individual households.[1] Also birth place for two most famous people from this Municipality Chef Santosh shah and Upendra mahato