Nippon Seikō K.K. (Japanese 日本精工株式会社 Nippon Seikō Kabushiki-kaisha; meaning: Japanese Precision Company English NSK Ltd.), listed in the Nikkei 225, ISIN JP3720800006, is a Japanese company headquartered in Tokyo.

NSK produces a wide range of industrial bearings, linear motion products, automotive bearings & modules as well as automotive steering systems. NSK´s products and solutions are sold globally through NSK´s own sales network.