Rebirth in Buddhism is the doctrine that the evolving consciousness (Pali: samvattanika-viññana) or stream of consciousness (Pali: viññana-sotam, Sanskrit: vijñāna-srotām, vijñāna-santāna, or citta-santāna) upon death (or "the dissolution of the aggregates" (P. khandhas, S. skandhas)), becomes one of the contributing causes for the arising of a new aggregation. The consciousness in the new person is neither identical nor entirely different from that in the deceased but the two form a causal continuum or stream.

In traditional Buddhist cosmology these lives can be in any of a large number of states of being including the human, any kind of animal and several types of supernatural being (see Six realms). Rebirth is conditioned by the karmas (actions of body, speech and mind) of previous lives; good karmas will yield a happier rebirth, bad karmas will produce one which is more unhappy. The basic cause for this is the abiding of consciousness in ignorance (Pali: avijja, Sanskrit: avidya): when ignorance is uprooted, rebirth ceases. One of the analogies used to describe what happens then is that of a ray of light that never lands.

Rebirth may refer to:

Buddhism is a religion and philosophy indigenous to the Indian subcontinent and encompasses a variety of traditions, beliefs, and practices largely based on teachings attributed to Siddhartha Gautama, who is commonly known as the Buddha (meaning "the awakened one" in Sanskrit and Pāli). The Buddha lived and taught in the eastern part of Indian subcontinent some time between the 6th and 4th centuries BCE. He is recognized by Buddhists as an awakened or enlightened teacher who shared his insights to help sentient beings end ignorance (avidyā), craving (taṇhā), and suffering (dukkha), by recognizing dependent origination and sunyata, and attain Nirvana.

Two major branches of Buddhism are recognized: Theravada ("The School of the Elders") and Mahayana ("The Great Vehicle"). Theravada has a widespread following in Sri Lanka and Southeast Asia. Mahayana is found throughout East Asia and includes the traditions of Pure Land, Zen, Nichiren Buddhism, Tibetan Buddhism, Shingon, Tiantai (Tendai) and Shinnyo-en. In some classifications, Vajrayana—practiced mainly in Tibet and Mongolia, and adjacent parts of China and Russia—is recognized as a third branch, while others classify it as a part of Mahayana. There are other categorisations of these three Vehicles or Yanas.

Lama Ole Nydahl (born March 19, 1941) is a Danish Lama in the Karma Kagyu school of Tibetan Buddhism under guidance of Trinley Thaye Dorje. Since the early 1970s, Nydahl has toured the world giving lectures and meditation courses. With his wife, Hannah Nydahl, he founded Diamond Way Buddhism, a worldwide lay organization of Karma Kagyu Buddhism.

Nydahl is the author of nine books in English, including The Way Things Are, Entering the Diamond Way, and Riding the Tiger.

Ole Nydahl was born in Copenhagen and grew up in Denmark. In the early 1960s, he served briefly in the Danish Army, then studied philosophy, English, and German at the University of Copenhagen, where he completed the examen philosophicum with the best possible grade. He began but did not finish a doctoral thesis on Aldous Huxley’s Doors of Perception. As a young man, Nydahl was involved in boxing, race car driving and also travelled overland from Denmark to Nepal several times. As described in his book "Entering the Diamond Way", his travels were financed through smuggling, for which he was once arrested and detained in Denmark.