Masatoshi Masanobu (1911 Suzuki City, Japan – 1995 Kochi Prefecture, Japan) was
an artist and a founding member of the Gutai groub.
In 1933 he graduated at the Kochi Prefecture Teacher-Training School and afterwards taught art courses in Kochi, in Tokyo and in Kobe.
He met Jiro Yoshihara in 1948 and became one of his students. Together with Yoshihara, the leader of Gutai, Masanobu joined the Gutai Art Association as a founding member between 1954 and 1972. He is one of the few members who participated in every Gutai exhibition from 1955 until the year 1968.