Sundarar or Sundaramurthi (Tamil சுந்தரர், 8th century CE), also known affectionately as Tampiran Tōzhan (Comrade of the Master (Shiva)) was one of the most prominent among the Nayanars, the Shaiva bhakti (devotional) poets of Tamil Nadu. He was a contemporary of Cheraman Perumal and Kotpuli Nayanar who also figure in the 63 Nayanmars. The songs of praise are called Thiruthondathogai and is the original nucleus around which the Periyapuranam is based. The Periya Puranam, which collects the legends of the Nayanars, starts and ends with him. The hymns of seventh volume of the Tirumurai, the twelve-volume compendium of the poetry of Tamil Shaiva Siddhanta, were composed by him.
