Sundarar, also referred to as Chuntarar, Chuntaramurtti, Nampi Aruran or Tampiran Tolan, was an eighth-century poet-saint of Tamil Shaiva Siddhanta tradition of Hinduism. He is among the Tevaram trio, and one of the most prominent Nayanars, the Shaiva bhakti (devotional) poets of Tamil Nadu.

Shaiva Siddhanta is a form of Shaivism popular in South India and Sri Lanka which propounds a devotional philosophy with the ultimate goal of experiencing union with Shiva. It draws primarily on the Tamil devotional hymns written by Shaiva saints from the 5th to the 9th century CE, known in their collected form as Tirumurai. Tirumular is considered to be the propounder of the term Siddhanta and its basic tenants. In the 12th century, Aghorasiva, the head of a branch monastery of the Amardaka order in Chidambaram, took up the task of formulating Shaiva Siddhanta. This is an earliest known Aghora Paddhati system of Shaiva Siddhanta of Adi Shaivas mathas in Kongu Nadu which rejects the Meykanda Shastras as a later addition. Meykandar was the first systematic philosopher of the school. The normative rites, cosmology and theology of Shaiva Siddhanta draw upon a combination of Agamas and Vedic scriptures.