Thiruthuraiyur Arulmigu Sishta Guru Nadhar Temple (historically known as Thiru Thuraiyur) is an ancient 10th-century Chola granite sanctuary and the 15th holy Paadal Petra Sthalam in the historic Nadu Naadu region of Tamil Nadu. Located along the Pennai riverbank near Panruti in Cuddalore district, this revered temple holds deep philosophical significance as a paramount Guru Peetham, where Lord Shiva manifested as the supreme preceptor (Sishta Guru Nadhar) to impart sacred initiation (Thavaneri Diksha) to Saint Sundaramurthy Nayanar.
Enshrined in the 7th-century Tamil Tevaram hymns composed by Saint Sundarar, Thiruthuraiyur is also celebrated as the birthplace and Samadhi sthalam of Arulnandi Shivachariyar, author of Sivagnana Siddhiyar (one of the foundational treatises of Shaiva Siddhanta philosophy). The temple complex features a classic Dravidian Rajagopuram, an inner sanctum housing the Swayambhu Lingam of Sishta Guru Nadhar, a dedicated shrine for Goddess Poongothai Nayaki, the sacred Marudha tree (Sthala Vriksham), and the holy Surya Theertham. Pilgrims visit Thiruthuraiyur to pray for Guru grace, educational excellence, career clarity, and spiritual progress.