| Kalyanpur | |
| Native Name: | कल्याणपुर |
| Settlement Type: | Municipality |
| Pushpin Map: | Nepal |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Nepal |
| Coordinates: | 26.86°N 86.22°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Nepal |
| Subdivision Type1: | Zone |
| Subdivision Type2: | District |
| Subdivision Name1: | Sagarmatha Zone |
| Subdivision Name2: | Siraha District |
| Leader Title: | Mayor |
| Leader Name: | Surya Nath Mandal |
| Leader Title1: | Deputy Mayor |
| Leader Name1: | Rohini Kumari Yadav |
| Population Total: | 49288 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Website: | http://www.kalyanpurmun.gov.np/ |
| Timezone: | Nepal Time |
| Utc Offset: | +5:45 |
Kalyanpur is a municipality in Siraha District in the Sagarmatha Zone of south-eastern Nepal. At the time of the 2011 Nepal census it had a population of 49288 people living.[1]