Ōnin War

Ōnin War
	; 19th-century print by Utagawa Yoshitora depicting a battle
Date	1467–1477
Location	Throughout Japan, though most intense fighting in Kyoto and Yamashiro Province
Result	Hosokawa wins the war, both sides are militarily exhausted and the Ōuchi abandon Kyoto. Hosokawa clan gains control of the shogunate and Ashikaga Yoshihisa becomes shōgun; Most of Kyoto destroyed; Emergence of the Ikkō-ikki; Continuing civil war within the Hatakeyama clan; Disintegration of the power of the shogunate, beginning of the Sengoku period;
Belligerents
Eastern Camp: Hosokawa clan; Hatakeyama clan (pro-Masanaga faction); Shiba clan (pro-Yoshitoshi faction); others;	Western Camp: Yamana clan; Ōuchi clan; Hatakeyama clan (pro-Yoshinari faction); Shiba clan (pro-Yoshikado faction); others;
Commanders and leaders
Hosokawa Katsumoto; Hatakeyama Masanaga; Shiba Yoshitoshi; others	Yamana Sōzen; Ōuchi Masahiro; Hatakeyama Yoshinari; Shiba Yoshikado; others
Strength
c. 160,000	c. 116,000

The Ōnin War (応仁の乱, Ōnin no Ran), also known as the Upheaval of Ōnin and Ōnin-Bunmei war, was a civil war that lasted from 1467 to 1477, during the Muromachi period in Japan. Ōnin refers to the Japanese era during which the war started; the war ended during the Bunmei era. A dispute between a high official, Hosokawa Katsumoto, and a regional lord, Yamana Sōzen, escalated into a nationwide civil war involving the Ashikaga shogunate and a number of daimyō (大名, feudal lords) in many regions of Japan.

The war initiated the Sengoku period, "the Warring States period." This period was a long, drawn-out struggle for domination by individual daimyō, resulting in a mass power-struggle between the various houses to dominate the whole of Japan.