Thiruvanchikulam Siva Temple is a Hindu temple situated in Kodungallur in Thrissur district of Kerala state, India. Constructed in the Kerala style of architecture, the temple is believed to have been built during the Chera period. Shiva is worshipped as Mahadeva and his consort Parvathi as Umadevi. There are 33 sub-deities in this temple, the highest number so in Kerala.

Kodungallur is a historically significant town situated on the banks of river Periyar on the Malabar Coast in Thrissur district of Kerala, India. It is 29 kilometres (18 mi) north of Kochi (Cochin) by National Highway 66 and 38 km (24 mi) from Thrissur. Kodungallur, being a port city at the northern end of the Kerala lagoons, was a strategic entry point for the naval fleets to the extensive Kerala backwaters.