The Shiva Purana or Shiva Mahapurana is one of the puranas (a genre of Hindu religious texts), dedicated to the god Shiva. According to a tradition which is stated in the Vāyaviya Saṁhitā (the Venkateshvara Press edition) of this text, the original text was known as the Shaiva Purana. Shiva Purana is a tamas purana as per the Padma Purana.
According to tradition, the purana originally consisted of twelve Saṁhitās and 100,000 shlokas (verses). After the reconstruction and the abridgment by Vedavyasa, the extant text comprises 24000 ślokas (verses), which he taught to his disciple Romaharshana (or Lomaharshana). JL Shastri, in his book, “The Siva Purana”, suggests that the Vayu Purana is either a part of the complete Shiva Purana of twelve Saṁhitās or has a close relationship with it.