The Kadam school () of Tibetan Buddhism was an 11th century Buddhist tradition founded by the great Bengali master Atiśa (982-1054) and his students like Dromtön (1005–1064), a Tibetan Buddhist lay master. The Kadampa stressed compassion, pure discipline and study.
The most evident teachings of that tradition were the graduated teachings on the Mahayana path. These special presentations became known as lojong (mind training) and lamrim (stages of the path). Kadam masters like Atiśa also promoted the study of madhyamaka philosophy. According to Ronald M. Davidson, "Atiśa's coming to Tibet in 1042 was the threshold moment in the efflorescence of Buddhism and provided a stable foundation for monastic scholarship for the next thousand years."
With the rise of new Tibetan Buddhist schools like Sakya and Gelug, Kadam ceased to exist as an independent school, and its monasteries, lineages and traditions were absorbed into all major schools of Tibetan Buddhism. Because of this, Kadampa lineages remained strong long after the school disappeared.
The most important founding figure of the Kadam tradition is Atiśa Dīpankara Śrījñāna (982–1054), an Indian Buddhist master who was known as a great teacher at Vikramaśīla and traveled to Tibet in 1037 on the invitation of a princeling named Jangchub O. Atiśa's poem, the Lamp for the Path to Enlightenment (Bodhipathapradīpa; Tib. Byang chub lam sgron) was an influential text which laid out the stages of the path to Buddhahood. He also helped translate some texts into Tibetan, taught Buddhism and wrote on Vajrayana practice. Atiśa's main teaching focus was on presenting a comprehensive Buddhist Mahayana system, and his numerous works explain basic topics such as bodhicitta, the six perfections, the two truths, dependent origination, karma, and Madhyamaka philosophy.
Over time he drew several students around him, including the influential Dromtönpa Gyelwé Jungné, who convinced Atiśa to stay in Tibet indefinitely. This Buddhist circle was part of the "later diffusion" of Buddhism in Tibet.