Masanobu (written: 雅信, 雅伸, 政信, 政伸, 正信, 正謖, 昌信 or 昌伸) is a masculine Japanese given name. Notable people with the name include:
Masanobu Ando (安藤 政信) (born 1975), Japanese actor
Chiyonoyama Masanobu (千代の山 雅信) (1926–1977), Japanese sumo wrestler
Masanobu Deme (出目昌伸) (born 1932), Japanese film director
Masanobu Endō (遠藤 雅伸) (born 1953), Japanese video game designer
Masanobu Fuchi (渕 正信) (born 1954), Japanese professional wrestler
Masanobu Fukuoka (福岡 正信) (1913–2008), Japanese farmer and philosopher
Honda Masanobu (本多 正信) (1538–1616), Japanese daimyō
Inaba Masanobu (稲葉 正謖) (1749–1806), Japanese daimyō
Masanobu Izumi (泉 政伸) (born 1944), Japanese footballer
Masanobu Kikukawa (喜久川 政信) (born 1954), Japanese karateka
Kanō Masanobu (狩野 正信) (1434?–1530?), Japanese painter
Masanobu Kimura (born 1960), Japanese golfer
Kōsaka Masanobu (高坂 昌信) (1527–1578), Japanese samurai
Masanobu Matsunami (松波 正信) (born 1974), Japanese footballer
Minamoto no Masanobu (源 雅信) (920–993), Japanese kugyō
Okumura Masanobu (奥村 政信) (1686–1764), Japanese print designer, book publisher and painter
Masanobu Shinozuka (born 1930), Japanese engineer
Masanobu Takashima (高嶋 政伸), Japanese actor
Masanobu Tsuji (辻 政信) (1901–ca.1961), Japanese military leader
