The Ikedaya Incident (池田屋事件, Ikedaya jiken), also known as the Ikedaya Affair, was an armed encounter between the shishi which included masterless samurai (ronin) formally employed by the Chōshū and Tosa clans (han), and the Shinsengumi, the Bakufu's special police force in Kyoto on July 8, 1864 at the Ikedaya Inn in Kyoto, Japan.