| Order: | Lord of Ikuchiyama Castle |
| Termstart: | 1567 |
| Termend: | 1582 |
| Saitō Toshikazu | |
| Native Name: | 齋藤 俊一 |
| Death Date: | July 2, 1582 |
| Birth Place: | Mino Province |
| Death Place: | Battle of Yamazaki |
| Allegiance: | Saito clan Oda clan Akechi clan |
| Commands: | Ikuchiyama Castle |
| Battles: | Siege of Inabayama (1567) Tanba Campaign (1575) Battle of Yamazaki (1582) |
Saitō Toshikazu (齋藤俊一) (died 1582), also known as Saitō Toshizo (斎藤歳三), was lord of Ikuchiyama in Tanba Province as well as a member of the Saitō clan. Toshikazu was Saito Tatsuoki cousin, head of Saitō clan.
In 1567, after the Battle of Inabayama, Toshikazu became a vassal of Akechi Mitsuhide, who was a retainer of the Oda clan.
In 1582, at the Battle of Yamazaki, the battle between Oda Nobunaga's two de facto successors, Akechi Mitsuhide and Toyotomi Hideyoshi. Toshikazu became a commander of Akechi clan forces. During the battle, he tried to flank Hideyoshi's lines but was defeated and executed by Horio Mosuke.[1]