Kyokushin (極真) or Kyokushinkai (極真会) is a style of stand-up, full contact karate founded by Masutatsu Oyama (大山倍達) in 1964. Kyokushinkai is Japanese for "the society for the ultimate truth."

Originally existing as a single organization, Kyokushin now exists as several large organizations with the "Kyokushin" title, plus various other organizations that teach similar techniques but go by different names. Also, numerous dojo throughout the world claim to teach a Kyokushin curriculum without formally belonging to one of the Kyokushin "umbrella" organizations. Although difficult to quantify, it is conjectured that the number of students and instructors involved in learning or teaching the style or one of its close variations around the world is significant. Some estimates have put this number as high as 10 million, 12 million and even 20 million.

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