Saitō Toshimitsu (斎藤 利三, 1534 – July 6, 1582) was a Japanese samurai of the Sengoku period and commander of Kuroi Castle.

[1] He was a retainer of Inaba Ittetsu,[2] but later joined Akechi Mitsuhide.

Toshimitsu was also vital in Akechi's betrayal at Honnō-ji and at the Battle of Yamazaki.

[3] He was the father of the Lady Kasuga, who became a preeminent retainer of the Tokugawa shogunate.

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