The main part of this two-Volume publication consists of the edition of the Sanskrit text of Vajravali Nama Mandalopayika and its Tibetan version. This work was written by Abhayakaragupta, a famous abbot of the Vikramasila monastery around 1100 AD, in order to synthesize and systematize the rituals of Tantric Buddhism, and it is regarded as one of the most voluminous and important compendia of this field. Although more than ten manuscripts of this work are available and its Tibetan translation exists in the bsTan 'gyur section of the Tibetan Tripitaka, its complete critical editions had not yet been published, until now.