Masaki Sato (佐藤 優樹 Satō Masaki, born May 7, 1999 in Sapporo, Hokkaido) is a Japanese pop singer. She is a tenth-generation member of the pop group Morning Musume.
In 2011, Masaki participated in the 10th generation auditions for Morning Musume. Throughout September, she appeared weekly on the TV show Hello Pro! Time in the segment dedicated to the auditions.
On September 29, 2011, at a concert at Nippon Budokan, which was part of Morning Musume Concert Tour 2011 Aki Ai Believe: Takahashi Ai Sotsugyō Kinen Special, it was announced that Masaki Sato passed the auditions alongside 3 other girls: Haruna Iikubo, Ayumi Ishida, and Haruka Kudo.
On January 11, 2012, Nippon Television started broadcasting the TV weekly drama Sūgaku Joshi Gakuen with Masaki Sato in the role of Rion Miyamasu. The TV series became her acting debut.
Hello! Project groups and units
- Greeting: Satō Masaki (Greeting 〜佐藤優樹〜) (2012, e-Hello! series)
- Morning Musume
- Hello! Project Mobekimasu
- Hello Pro! Time (ハロプロ!TIME) (September 2011 —)
- Morning Musume Concert Tour 2011 Aki Ai Believe: Takahashi Ai Sotsugyō Kinen Special (コンサートツアー2011秋 愛BELIEVE～高橋愛 卒業記念スペシャル～) (September 2011)
- Hello! Project 2012 Winter Hello☆Pro Tengoku: Rock-chan
- Hello! Project 2012 Winter Hello☆Pro Tengoku: Funky-chan
- Morning Musume Concert Tour 2012 Haru: Ultra Smart (February 18, 2012 — May 13, 2012 )