Vajrasattva is a Buddhist deity originating in India and primarily functioning universally as a Tantric practice for the purification of sins and defilements. Vajrasattva also has a number of forms used as meditational deities (ishtadevata, yidam).

The 'Solitary Universal Ruler,' in the single aspect without consort, arises from the Yoga Tantras. Vajrasattva is the inner form of the primodial buddha Vajradhara and represents all the Buddha Families.

In the New (Sarma) Schools of Tibetan Buddhism Vajrasattva with consort arises from the class of Anuttarayoga Tantra, specifically from the Abhidhanottara Tantra, 25th chapter, and is known as Heruka Vajrasattva.

In the Nyingma Tradition Vajrasattva is not only a deity of purification but an important meditational deity with many Kama (Oral) and Terma (Treasure) traditions. The most famous meditational form is the Vajrasattva of the Mindroling Monastery Tradition commonly known as the Min-ling Dor-sem.