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The YKK Group is a Japanese group of manufacturing companies. Founded in 1934 by Tadao Yoshida in Higashi Nihonbashi, Tokyo, it was originally known as San-Es Shokai (サンエス商会). It was renamed to Yoshida Kogyosho (吉田工業所) in 1938, to Yoshida Kogyo K.K. (Yoshida Kogyo Kabushiki Kaisha, 吉田工業株式会社) in 1945, and to YKK (YKK Kabushiki Kaisha, YKK株式会社) in 1994. The name YKK was first registered as a trademark in 1946.
Today the YKK Group is most famous for making zippers, although it also does business in other fastening products, architectural products, and industrial machinery.