Neyyadiappar Temple, Hindu temple in Thillaisthanam, India

Neyyadiappar Temple is a Hindu temple in Thillaisthanam with two precincts and five-tiered gopurams. The east-facing central shrine has a square sanctum of about 6 m (20 ft) topped by a stone dvitala vimana; its first level holds niches of Dakshinamurthy, Vishnu and Brahma. The arthamandapa entrance has six-foot dvarapala images, and the Amman shrine, dated to the 13th century, faces south in the second precinct.

The temple was established in the 9th century during the reign of Aditya Chola I when the Chola empire dominated the region. Inscriptions on the walls record donations and modifications made later by various kingdoms and rulers who controlled the area.

The temple is one of the Saptasthanam, seven villages linked to the Aiyarappar temple at Thiruvaiyaru. Each April, after the full moon of the Tamil month of Chittirai, Aiyarappar and his consort set out to visit the seven villages; the deity of each village receives him, and the next morning all seven images return to Thiruvaiyaru for the bommai poo ceremony. The temple is also a Paadal Petra Sthalam, sung in the Tevaram by the nayanars Sambandar and Appar.

The temple sits about 21 kilometers from Kumbakonam and is reachable via the main road connecting Kumbakonam and Tiruvaiyaru. Regular bus and car services run along this route, making it straightforward for visitors from larger cities to reach the site.

Local stories tell of the temple's origin involving a sacred cow whose milk miraculously transformed into pure ghee. This legendary substance led to the discovery of a Shivalinga, becoming central to the founding tale of the place.