Suganuma Sadamichi (菅沼貞道) was a samurai commander in Japan's Sengoku period. He fought in the 1570 battle of Anegawa.
He also participated in the 1573 siege of Noda, in which he attempted to defend Noda castle against Takeda Shingen.
It is unclear if Sadamichi might be the same person as Suganuma Sadamitsu (1542-1604), who served the Imagawa and Tokugawa.
References
Suganuma Sadamichi Wikipedia(Text) CC BY-SA