| Mahadevasthan | |
| Native Name: | महादेवस्थान |
| Nickname: | Halesi, Maratika |
| Settlement Type: | Village Development Committee |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 360 |
| Pushpin Map Caption: | Location in Nepal |
| Subdivision Type: | Country |
| Subdivision Name: |  Nepal |
| Subdivision Type1: | Zone |
| Subdivision Name1: | Sagarmatha Zone |
| Subdivision Type2: | District |
| Subdivision Name2: | Khotang District |
| Population As Of: | 1991 |
| Population Total: | 2343 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Timezone: | Nepal Time |
| Utc Offset: | +5:45 |
Mahadevasthan is a village and Village Development Committee in Khotang District in the Sagarmatha Zone of eastern Nepal. At the 1991 Nepal census, it had a population of 2,343 persons living in 453 individual households.[1]
Mahadevasthan is the location of the Halesi-Maratika caves, a popular pilgrimage destination for both Hindus and Himalayan Buddhists.