Thidanadu Mahadeva temple is located at Thidanadu village around 5 kilometer from Erattupetta in Kottayam district, Kerala. The 10-day annual festival ends with Arattu on the day after Shivratri.
The main murtis worshipped in the temple are Shiva, Sri Krishna and Narasimha. Shiva and Sri Krishna face east and Narasimha faces west.
The belief is that the temple in beginning only had Shivling. Sri Krishna and Narasimha were consecrated in the temple by Thiruvudai Chettiar who had arrived here for business from Kaveripattinam.
There is a Prathishta of Thiruvudai Chettiar in the temple.
There is a unique ritual of asking whether there is any trouble (allalaapathukal) for Mundu Palathingal Kochu Govindan before the kodiyettam or flag hoisting of the annual festival.