Guy Buyens (born 5 May 1961, in Vilvoorde) is a Belgian sports physician, medical administrator, and martial arts practitioner and teacher, who specializes in traditional Japanese martial arts.
Buyens attended the Atheneum (Vilvoorde) and the Vrije Universiteit Brussel (Brussels), graduating with a medical degree in July 1986. He earned a post-graduate degree in sports medicine afterwards.
From 1992 to 2008, Buyens worked in the Pharmaceutical and Biotechnology Industry. Since 2009 he has been the Director of AZ Jan Portaels, a general hospital located in Vilvoorde, Belgium.
Buyens started martial arts (karatedà Â) in 1971 at the age of 10. In his youth he participated in several karatedà  competitive events including the European championships in Paris in 1984. In 1983, he was participating in a demonstration of Shità Â-ryà « karatedà  with the late Sohan Eiji Ogasahara, 9th dan, and Hidetoshi Nakahashi, 6th dan (currently 9th dan) in Italy. At that occasion he also witnessed a demonstration of Hontai Yà Âshin-ryà «, a koryà « or traditional Japanese martial art. The group was led by its sà Âke, Tsuyoshi Munetoshi Inoue, and left a deep impression on Buyens.
After finishing his medical training and while working at the University of Brussels, Buyens took out a 1-year sabbatical to study Shità Â-ryà « karatedà  with KenâÂÂei Mabuni-sensei (son of the founder) in à Âsaka, Japan. Close to à Âsaka, in Nishinomiya, is where Hontai Yà Âshin-ryà «âÂÂs Imazu dà Âjà  was located, which Buyens joined to study bà Âjutsu and iaidà  with Kyà Âichi Munenori Inoue, the son of the ryà «âÂÂs sà Âke, Tsuyoshi Munetoshi Inoue. He received iaidà Â-training from the late Kukio Kurishima, who had expertise in Toyama-ryà « iaidà  and Hontai Yà Âshin-ryà «. He participated in several Japanese enbu, such as notably, the 16th Isukushima Enbu Taikai in Miyajima (2005), and the 30th (2007) and 32nd (2009) Nihon Kobudà  Kyà Âkai enbu in Tà Âkyà Â.
Buyens is among a select number of Westerners who hold authentic Japanese credentials in koryà « martial arts. Buyens currently holds the ranks of 6th dan in Shità Â-ryà « karatedà  (from KenâÂÂei Mabuni) and of 6th dan/chà «den in Hontai Yà Âshin-ryà «. He is one of only three Belgians with verified authentic Japanese koryà « credentials, the other two being Serge Mol (Enshin-ryà « and Hà Âki-ryà « jà «jutsu) and Dr. Carl De Crée (Tenjin ShinâÂÂyà Â-ryà « of the Inoue Keitarà Â-lineage and Owari-ha Yagyà « Shinkage-ryà «).