| Kumagai Nobunao | |
| Native Name: | 熊谷 信直 |
| Birth Date: | 1507 |
| Death Date: | 1593 |
| Birth Place: | Aki Province |
| Death Place: | Kumagaya-shi Yakata |
| Commands: | Miiri-Takamatsu Castle |
| Battles: | Siege of Koriyama, Battle of Miyajima |
was a Japanese samurai and commander of the Sengoku period. Nobunao an Kumagai clan's ancestor was Kumagai Naozane.[1] He initially served the Aki Takeda clan, but he left Takeda clan and became a vassal of the Mōri Motonari.[1] He moved Kumagai clan's main bastion from Isegatsubo Castle to Miiri-Takamatsu Castle.[1] [2] [3]
In 1547, His daughter was married to Motonari's son Kikkawa Motoharu.[4] [1] Thus, Kumagai clan became an important servant of the Mōri clan.[1]