Ayiroor Mahavishnu temple is located at Kaipamangalam in Thrissur district, Kerala. The main murti worshipped in the temple is Vishnu Bhagavan. The murti is nearly 4 feet tall and darshanam of Ayiroor Mahavishnu is towards east. The annual festival in the temple is held in Meena Masam (March - April).
The Upa Devatas worshipped in the temple are Ganapathi and Sasthavu. Daily three pujas are held in the temple.
There are two ponds on the north side of the temple. It is said that the temple had three ponds.
In ancient times the temple belonged to Ayiroor swaroopam. The temple was then governed by Vakkayil Kaimal.
Ashtami Rohini festival in Chingamasam is of great importance in the shrine. The utsava murti of Bhagavan is taken atop chariot as part of the procession. Various Vaishnava pujas, rituals and festivities are part of the Krishna Janmashtami festival.