Karma Kagyu, or Kamtsang Kagyu, is a widely practiced and probably the second-largest lineage within the Kagyu school, one of the four major schools of Tibetan Buddhism. The lineage has long-standing monasteries in Tibet, China, Russia, Mongolia, India, Nepal and Bhutan, with current centres in over 60 countries. The spiritual head of the Karma Kagyu is the Gyalwa Karmapa; the 2nd through 10th Karmapas were principal spiritual advisors to successive emperors of China. The Karma Kagyu are sometimes called the "Black Hat" lamas, in reference to the Black Crown worn by the Karmapa.
The Kagyu lineage claims a continuity of oral instructions transmitted from master to disciple. This emphasis is reflected in the literal meaning of Kagyu. The first syllable, ka, is said to refer to the texts of Buddha's teachings and to the master's verbal instructions. Ka has the double meaning of the enlightened meaning imparted by a teacher's words, as well as the strength that such words of insight may bear. The second syllable, gyu, means lineage or tradition. The combination of these syllables thus means “the line of orally transmitted instructions.”