| Office: | Head of Imagawa clan |
| Term Start: | 1558 |
| Term End: | 1615 |
| Predecessor: | Imagawa Yoshimoto |
| Imagawa Ujizane | |
| Native Name: | 今川 氏真 |
| Birth Date: | 1538 |
| Death Date: | Januari 27, 1615 |
| Birth Place: | Sunpu Domain |
| Death Place: | Shinagawa |
| Allegiance: | Imagawa clan Tokugawa clan Tokugawa Shogunate |
| Father: | Imagawa Yoshimoto |
| Mother: | Jōkei-in |
| Children: | Imagawa Norimochi Shinagawa Takahisa |
| Spouse: | Lady Hayakawa |
| Rank: | Kōke |
| Battles: | Siege of Sunpu (1568) Siege of Kakegawa (1569) Battle of Nagashino (1575) |
was a Japanese daimyō who lived in the Sengoku period through the early Edo period. He was the tenth head of the Imagawa clan and was a son of Imagawa Yoshimoto and the father of Imagawa Norimochi and Shinagawa Takahisa.
Ujizane was born in Sunpu Domain; he was the eldest son of Imagawa Yoshimoto. In 1554, he married the daughter of Hōjō Ujiyasu (Lady Hayakawa) as part of the Kai-Sagami-Suruga Alliance. Ujizane inherited family headship in 1558, when his father retired in order to focus his attention on the Imagawa advance into Tōtōmi and Mikawa Provinces.[1] His childhood name was Tatsuomaru .
In 1560, Yoshimoto was killed in the Battle of Okehazama, the province of Totomi and Mikawa went into chaos. Ujizane succeeded his father, but due to the chaotic state of the Imagawa clan, many vassals betrayed Ujizane. His grandmother, Jukei-ni, who exercised great political power, died in 1568. Motivated by this, Takeda Shingen and Tokugawa Ieyasu attacked the lands of Imagawa.
Ujizane later retaliated against the landlocked Takeda clan with a salt embargo. This had little effect because Uesugi Kenshin took the opportunity to sell salt to the Takeda and only resulted in the downfall of the Imagawa clan.
In 1568, Shingen began his invasion into Suruga. The Imagawa army faced a debacle, and Sunpu Castle was quickly occupied. Later, Ujizane fled to Kakegawa Castle in Totomi Province.
After his defeat in the 1569 Siege of Kakegawa, Imagawa Ujizane allied himself with Ieyasu in return for help in recovering his territory in Suruga Province.[2] [3]
It is recorded in "Shincho Koki" (Account of Nobunaga) that in 1575, he had a conference with Oda Nobunaga and Tokugawa Ieyasu, at Sokoku-ji Temple. Also, he joined the army in the Battle of Nagashino against Takeda clan.
The Imagawa family was summoned by Tokugawa Ieyasu and made Tokugawa retainers, with the rank of kōke. Ujizane enjoyed playing Kemari and writing poetry. He died at the family estate in Shinagawa in 1615.