- Died: 1582
- Title: Bitchû no Kami
Masayuki was the son of Oyamada Masatatsu. He was the veteran of many Takeda battles and became one of Shingen's senior retainers. In 1582 he defended Takato against the Oda along with his younger brother Masatada and Nishina Morinobu. When the castle fell he was killed, one of the few senior Takeda men to both survive Nagashino and fight the Oda to the death - unlike his cousin Nobushige.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005