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.

Shaivism is one of the major Hindu traditions, which worships Shiva as the Supreme Being. One of the largest Hindu denominations, it incorporates many sub-traditions ranging from devotional dualistic theism such as Shaiva Siddhanta to yoga-orientated monistic non-theism such as Kashmiri Shaivism. It considers both the Vedas and the Agama texts as important sources of theology. According to a 2010 estimate by Johnson and Grim, Shaivism is the second-largest Hindu sect, constituting about 253 million or 26.6% of Hindus.