Marius Grout (born 8 November 1903 Fauville-en-Caux – 1 May 1946 Le Havre) was a French writer and poet.
In the late 1930s, he befriended a group of writers, which included Emile Danoën and his former pupil Pierre Aubery.
In 1937 he published his first book, Kagawa, through the Society of Friends.
He won the Prix Goncourt in 1943 for his novel Passage of rights.
He died at Le Havre and was buried in Incheville.