The Sayavaneswarar Temple is a Hindu temple situated in the village of Thirusaikkadu, near Puhar in Nagapattinam district of Tamil Nadu, India. The presiding deity is the Hindu god Shiva. The temple dates from the time of the Medieval Cholas. The Saivite Nayanmars have sung of the temple in their songs.
The temple occupies around 2 acre of land and a tank across the temple.
Lord Vishnu worshipped Lord Shiva to acquire the famous conch, Panchajanyam. There is a famous temple, Thalai Sanga Nanmathiyam, a Divyadesam, dedicated to Lord Vishnu in the same village.