Classes of Tantra in Tibetan Buddhism refers to the categorization of Buddhist tantric scriptures in Indo-Tibetan Buddhism.
Tibetan Buddhism inherited numerous tantras and forms of tantric practice from medieval Indian Buddhist Tantra.
There were various ways of categorizing these tantras in India. In Tibet, the Sarma schools categorize tantric scriptures into four classes, while the Nyingma (Ancients) school use six classes of tantra.
Apart from classical Mahāyāna Buddhist practices like the six perfections, Tibetan Buddhism also includes tantric practices, such as deity yoga and the Six Dharmas of Naropa as well as methods which are seen as transcending tantra, like Dzogchen.
In Tibetan Buddhism, practices are generally classified as either Sutra (or Pāramitāyāna) or Tantra (Vajrayāna or Mantrayāna), though exactly what constitutes each category and what is included and excluded in each is a matter of debate and .
The Buddhist Tantras are a varied group of Indian and Tibetan texts which outline unique views and practices of the Buddhist tantra religious systems.
Buddhist Tantric texts began appearing in the Gupta Empire period though there are texts with elements associated with Tantra that can be seen as early as the third century.
By the eighth century, Tantra was a dominant force in North India and the number of texts increased with numerous Tantric pandits writing .
Vajrayana is Tantric Buddhism, the form of Northern Buddhism that relies primarily on the Tantras, technical manuals said to have been taught by the Buddha, and offer complete enlightenment in 1, 7 or 21 lifetimes.
Vajrayāna practices are connected to specific lineages in Buddhism, through the teachings of lineage holders. Others might generally refer to texts as the Buddhist Tantras. It includes practices that make use of mantras, dharanis, mudras, mandalas and the visualization of .