Nilkanth Mandir Chainpur is an important Shiva temple located in Chainpur, Saharsa, Bihar. The temple is dedicated to Lord Shiva, worshipped here as Neelkanth Mahadev. It is regarded as an old and spiritually significant shrine in the region. Devotees from Chainpur and nearby villages visit the temple to offer water, flowers and prayers to Lord Shiva. The temple receives special religious activity during the month of Sawan and on Mahashivratri, when many Shiva devotees gather for worship. The temple complex is also associated with several old stone sculptures, including representations of Lord Vishnu and Surya. Traditional accounts connect the temple with the religious heritage of the Mithila region. The peaceful surroundings and devotional atmosphere make it an important place of worship for devotees.