Ambalamedu Harimattom temple is located around 9 km east of Tripunithura in Ernakulam District, Kerala. The 8-day annual festival in the temple begins on the Uthram nakshatra in Medam month. The festival is also known as Harimattom Pooram and is noted for the participation of elephants.
The temple has murtis of Shiva and Vishnu and both have equal prominence in the temple. Shiva faces east and Vishnu faces west.
The main subsidiary deities or upadevatas worshipped in the temple are Sastha, Ganapathy, Bhagavathi, Bhadrakali, Rakshas, Vanadurga, Nagaraja and Nagayakshi.
The temple only performs Uccha puja and Athazha puja.