Shivarahasya Purana (Sanskrit: शिव रहस्य पुराण; IAST: śiva rahasya purāṇa) is one of the 'Shaiva Upapuranas' or ancillary Purana regarding Shiva and Shaivite worship and is also considered 'Indian epic poetry' (Sanskrit: Itihāsa). Its origins are acclaimed to be over 7000 years old. The book is dedicated to detailed explanation of Shaivite thoughts, rituals and religious myths. The manuscripts are found in various ancient literature. But, there has been no critical study of the same. It is one of the first few works of the acclaimed Saint Ribhu, who was taught by Shiva himself.