Vajrasattva (Sanskrit: वज्रसत्त्व, Tibetan: རྡོ་རྗེ་སེམས་དཔའ། Dorje Sempa, short form: རྡོར་སེམས། Dorsem)[1] is a bodhisattva in the Mahayana and Mantrayana/Vajrayana Buddhist traditions.

Vajrasattva's mantra is oṃ Vajrasattva hūṃ (Sanskrit: ॐ वज्रसत्त्व हूँ; Chinese: 唵 斡資囉 薩答 啊 吽 / 嗡 班扎 薩埵 吽; Pinyin: ǎn wòzīluō sàdá a hōng / wēng bānzhā sàduǒ hōng).

The śatākṣara (100 syllable prayer to Vajrasattva) is memorized by many practicing Newar Buddhist priests.

Kukai, in Record of the Dharma Transmission, relates a story based on Amoghavajra's account, of Nagarjuna having met Vajrasattva in an iron tower in southern India.

Vajrasattva initiated Nagarjuna into the abhiseka ritual and entrusted him with the esoteric teachings he had learned from Vairocana Buddha, as depicted in the Mahavairocana Sutra.

In the first chapter of the Mahavairocana Sutra, Vajrasattva leads a host of beings who visit Vairocana Buddha to learn the Dharma.

Vajrasattva inquires about the cause, goal and foundation of all-embracing wisdom, which leads to a philosophical discourse delivered by the Buddha.

Vairocana Buddha replies to Vajrasattva that these are expedient means, whose function is to bring practitioners to awakening more readily, and so on.

[citation needed] In certain esoteric Chinese Buddhist rituals, such as the Grand Mengshan Food Bestowal ceremony (Chinese: 蒙山施食; pinyin: méngshān shīshí) and the Samadhi Water Repentance Ceremony (Chinese: 三昧水懺; pinyin: Sānmèi shuǐchàn), Vajrasattva's mantra is commonly recited as part of the liturgy, while the performing monastic uses ritual vajras and ghantas to expel demons from the ritual platform.

In addition to personal practice, the Vajrasattva mantra is regarded as having the ability to purify karma, bring peace, and cause enlightened activity in general.

Following the September 11, 2001 attacks on the United States, The Dzogchen Ponlop Rinpoche announced a project, Prayer 4 Peace, to accumulate one billion six syllable Vajrasattva recitations from practitioners around the world.

[5] "The Mirror of the Heart of Vajrasattva" (Tibetan: རྡོ་རྗེ་སེམས་དཔའ་སྙིང་གི་མེ་ལོང, Wylie: rdo rje sems dpa' snying gi me long) is one of the Seventeen Tantras of Dzogchen Upadesha.

Dorje Nyema), Dharmadhatvishvari, Ghantapani ("Bell Bearer"), the wrathful one Diptacakra, Vajratopa, Vajrabhrikuti, and others.

Fāgéwān Sàlīwǎ Dátǎgédá Wòzīluō Má Mí Ménzā | Wòzīlī Fāwǎ Máhē Sàmóyé Sàduǒ A || oṃ

The yik gya, the "Hundred Syllable Mantra" (Tibetan: ཡིག་བརྒྱ་, Wylie: yig brgya) supplication of Vajrasattva, approaches universality in the various elementary Ngondro sadhana for sadhakas of all Mantrayana and Sarma schools bar the Bonpo.

The evocation of the Hundred Syllable Vajrasattva Mantra in the Vajrayana lineage of Jigme Lingpa's (1729–1798) ngondro from the Longchen Nyingtig displays Sanskrit-Tibetan hybridization.

[11] Though Jigme Lingpa did not compose the Hundred Syllable Mantra, his scribal style bears a marked similarity to it as evidenced by his biographies (Gyatso, 1998).

[12] Jigme Lingpa as pandit, which in the Himalayan context denotes an indigenous Tibetan versed in Sanskrit, often wrote in a hybridized Sanskrit-Tibetan diglossia.