Ōuchi Yoshioki (大内 義興, April 7, 1477 – January 29, 1529) became a sengoku daimyō of Suō Province and served as the 15th head of the Ōuchi clan. Yoshioki was born early in the Sengoku period, the son of Ōuchi Masahiro, shugo of Suō Province and the 14th head of the Ōuchi clan. The first character in Yoshioki's name originated from Ashikaga Yoshihisa, the ninth shōgun in the Muromachi bakufu. In 1492, Masahiro ordered Yoshioki to join the battle against , a sengoku daimyō from southern Ōmi Province. In the midst of this engagement in 1493, an incident known as the Meiō no seihen occurred, by which Hosokawa Masamoto, a kanrei, or deputy, held the shōgun, Ashikaga Yoshiki, in confinement. Yoshioki withdrew his men from the battle to Hyōgo in Settsu Province to wait for the outcome of the event