Vajrasattva is a bodhisattva in the Mahayana, Mantrayana/Vajrayana Buddhist traditions. In the Japanese Vajrayana school of Buddhism, Shingon, Vajrasatva is the esoteric aspect of the bodhisattva Samantabhadra and is commonly associated with the student practitioner who through the master's teachings, attains an ever-enriching subtle and rarefied grounding in their esoteric practice. In Tibetan Buddhism Vajrasatva is associated with the sambhogakāya and purification practice.
Vajrasatva appears principally in two Buddhists texts: the Mahavairocana Sutra and the Vajrasekhara Sutra. In the Diamond Realm Mandala, Vajrasatva sits to the East near Akshobhya Buddha.
In some esoteric lineages, Nagarjuna was said to have met Vajrasatva in an iron tower in South India, and was taught tantra, thus transmitting the esoteric teachings to more historical figures.
His Mantra is Oṃ Vajrasattva Hūṃ.