Namkulam Sastha Temple is located Avinissery on the Poochinnipadam – Ollur road in Thrissur district, Kerala. There are three temples in the compound – Karippukavu Bhagavathi, Namkulam Sastha and Avinissery Vishnu.
Pooja is only offered to Avinissery Vishnu. Naivedyam is offered to Bhagavathi and Sastha.
There is a saying that property is of Bhagavathi but it is enjoyed by Vishnu and the fame rests on Namkulam Sastha. (Swathu Bhagavathikku, Anubhavam Vishnuvinu and Prashasti for Sastha).
Namkulam Sastha takes part in the Arattupuzha Pooram.
Vishnu faces west. Bhagavathi and Sastha face east.
The main festival in the temple is observed on the Thrikarthika day in Vrischikam month. Irattakudam Pongala is held on the Thrikarthika day in the temple.