Amari Masatada (甘利 昌忠, 1543–1564) was a Japanese samurai of the Sengoku period of Feudal Japan.
During Shingen's campaign in Shinano Province, Masatada served with distinction at the Battle of Kawanakajima in 1561.
Masatada later fought at the Battle of Mikatagahara as a senior Takeda officer.
There is one incident which gave Masatada a stronger name for himself despite being rather eccentric in nature: when Masatada had confronted one of his wounded retainers who suffered from physical bleeding that would not cease flowing, he advised him to drink horse feces and water to support the clotting of his blood — considered among Japanese culture as a folklore.
The man was expectingly hesitant in doing so, but when Masatada himself consumed some of the concoction, he was encouraged to follow suit and reportedly recovered.