Bon or Bön (Tibetan: བོན་, Wylie: bon [pʰø̃̀(n)]) is a branch of Tibetan Vajrayana.

The history of Bon is difficult to clearly ascertain because the earliest surviving documents referring to the religion come from the 9th and 10th centuries, well after Buddhists began the suppression of indigenous beliefs and practices. Moreover, historian Per Kværne notes that "Bon" is used to describe three distinct traditions:

However, other scholars do not accept the tradition that separates Bon from Buddhism; Christopher Beckwith calls Bon "one of the two types of Tibetan Buddhism" and writes that "despite continuing popular belief in the existence of a non-Buddhist religion known as Bon during the Tibetan Empire period, there is not a shred of evidence to support the idea... Although different in some respects from the other sects, it was already very definitely a form of Buddhism."

Tenzin Gyatso, the 14th Dalai Lama, recognizes the Bon tradition as the sixth principal spiritual school of Tibet, along with the Nyingma, Sakya, Kagyu, Gelug and Jonang schools of Buddhism, despite the long historical competition between the Bon tradition and Buddhism in Tibet.