Sri Rathnapurisvarar Temple is a Lord Shiva temple in Thirunatiyathankudi in Thiruvarur district in Tamil Nadu. It is one of the padal petra sthalam and Lord Shiva here was worshipped by Sundarar and Thirugnasambandar.
The temple shiva lingam is a swayambu moorthy. There is also a Kari theertham, a temple pond made by an elephant here. This place is also the avatara sthalam for Kotpuli Nayanar.