The Police System of the Empire of Japan comprised numerous police services, in many cases with overlapping jurisdictions.

Kawaji Toshiyoshi , also known as Kawaji Toshikane, was a Japanese military general, politician, and samurai. during the Meiji period. A Satsuma Domain samurai initially tasked to study foreign systems for application in the Japanese military, Kawaji fought against forces loyal to the Tokugawa shogunate during the Boshin War. Later, his work on setting up the Japanese police at the aftermath of the Meiji Restoration, first as rasotsu, and then as keisatsu, earned him the recognition as the founder of Japan's modern police system . Besides his police and military work, he was also noted for his contributions to the development of Kendo, a Japanese martial art.