Thiruvallur Mahadeva temple is located at Eriyad on the Eriyad – Kodungallur road in Thrissur district, Kerala. The shrine is dedicated to Shiva who is swayambhu. The darshanam of the deity is towards east.
The Upa Devatas worshipped in the temple are Ganapathy, Sastha, Vettaikaran, Bhagavathy, Nagayakshi, Sri Krishna and Vadakkumnathan.
The main festival observed in the temple is Mahashivratri in Kumbham month.