| Chainpur, Saharsa | |
| Settlement Type: | Village |
| Pushpin Map: | India Bihar#India |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Bihar, India |
| Coordinates: | 25.52°N 86.31°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Type2: | District |
| Subdivision Name2: | Saharsa |
| Unit Pref: | Metric |
| Elevation M: | 41 |
| Population Total: | 25584 |
| Population As Of: | 2001 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Hindi, Maithili |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | PIN |
| Postal Code: | 852212 |
| Area Code Type: | Telephone code |
| Area Code: | 06478 |
| Iso Code: | IN-BR |
Chainpur is one of the largest villages of Saharsa District in the Indian state of Bihar in North-East India, and is in the Kosi Division. In the revenue documents, it is mentioned as 'Chainpur Uttar Khand'. Chainpur has a number of tolas and occasionally called Pubari, Pachhwari, Uttarwari and Dakshinwari tola.
Chainpur is part of Kahra Block. Chainpur is located in among Bariahi, Bangaon, Parari and Mahishi.
Chainpur and its surrounding areas are a flat alluvial plain forming part of the Kosi river basin. This makes the land very fertile.
Flooding is a major reason for the poor connectivity of the area as bridges tend to get washed away.
Paddy, wheat, moong, maize, sugarcane etc. are the main crops of this village. vegetables viz. potato, cauliflower, brinjal, carrot, radish, lady finger etc., are cultivated in this village.
Holi, Durga Puja and Kaali Puja are the main festival of Chainpur.Ramnavami, Janmashtami, Shivaratri, Hanuman jayanti etc. are also celebrated with full zest and fervour. Sama Chakeva, Chhath, Chaurchan etc. are other festivals of this village. Every year, a grand mela and wrestling Competition is organised on the occasion of Kali puja in the village.
In addition to a number of primary schools, following are the schools operating in Chainpur: