Saitō Toshimitsu (斎藤 利三, 1534 – July 6, 1582) was a Japanese samurai of the Sengoku period. He was a castle commander of Kuroi Castle. He was a retainer of Inaba Ittetsu, but later joined Akechi Mitsuhide.
|Lord of Kuroi Castle|
|Preceded by||Akai Naomasa|
|Succeeded by||Horio Yoshiharu|
|Died||July 6, 1582(aged 47–48)|
|Allegiance|| Saitō clan|
|Battles/wars||Siege of Kuroi Castle (1579)|
Honnoji Incident (1582)
Battle of Yamazaki (1582)
Oda Nobunaga was not pleased that Toshimitsu chose to work under Mitsuhide, and if not for Mitsuhide's intervention Nobunaga would have killed him.
Toshimitsu was also vital for the Akechi action at Honnō-ji and the Battle of Yamazaki.
He was the father of the Lady Kasuga, who became a preeminent retainer of the Tokugawa Shogunate.