Thrikkadavoor Mahadeva temple is located at Thrikkadavoor on the banks of Ashtamudi Lake and is 6 km north of Kollam town in Kerala. The Shivling worshipped in the temple is of swayambhu sankalpam (divine origin). The darshanam of Thrikkadavoor Shiva temple is towards west.
The Upa Devatas worshipped in the temple are Sri Krishna, Yakshi, Ganapathy, Sastha and Nagam.
The annual festival in the temple is known as Kadavoor Pathu. The 10-day festival begins on Chathayam nakshatra and ends on Thiruvathira nakshatram in Makaram month with arattu. The final day of the festival is famous for Kettukazhcha. The eduppu kuthira (ceremonial horse) is an offering to Shiva by the people of each desom surrounding the temple. Eight such ceremonial horses are brought to the shores on boats and then taken to the temple. The sight of the majestic horses is quite captivating.
Earlier 36 para ari (rice) Utsava Bali was performed on the 8th day of the festival.
The eight karas or desams that are part of the festival include Njarakkal, Neeravil, Kureepuzha, Thevally, Mathilil, Kadavoor, Kottakkakam and Murunthan.
As per history, the temple was known as Markandeyan Kovil.
The murti of Sri Krishna (Upa Devata) was consecrated by Vilwamangalam Swamiyar. The Shayana Pradakshinam (urul vazhipadu) is famous and it was started by Vilwamangalam swamiyar.
The Karanma Shanti is of Kaviyoor Mana. Kazhka Sthanam earlier belonged to Pavumba Warrier.
The temple belonged to Kambiyil Vallyathan (Naduvazhi), Koyipurathu Kuruppu (Kara Nathan), Pathanavil Kuruppu and Kallungodathu Kuruppu. The temple was given away to Travancore in Kolla Varsham 1112.