Agastyamuni Mandir is located around 25 km from Guptkashi and around 7 km from Tilwara in Uttarakhand. The shrine is dedicated to Sage Agastya. The sanctum sanctorum of the temple has a murti of Agastya Muni, Shringi Rishi and Hanuman.
The temple complex also has murtis of Sri Krishna and Vishnu. The mandap area of the temple has a Shivling with Lord Vishnu and Ganesha standing in front of the pillars.
The outside wall of the main temple has sculptures of Bhima and Hanuman.
The guardian deity of the shrine is Chetrapal Bhairav.
There is also a havan kund in the temple which is opened only once in twelve years.
The main temple structure is simple with its chhatra mounted with wooden cupola. A brass kalash is atop the shikar.
The important festival observed here are Panchami and Chath. Important rituals include Ratri Puja and Char Prahar Puja.
A shobha yatra, which passes through 217 villages, is held in Baishakh month.
The main offering in the shrine are sesame oil, first crops of the season, and seeds of bhang or cannabis.