Marcus Crouch (12 February 1913 – 24 April 1996) was an English librarian, and an influential commentator on and reviewer of children's books.
For the Library Association he compiled an account of those books that were awarded the Carnegie Medal in its first thirty years 1936–1957 in Chosen for Children: an account of the books which have been awarded the Library Association Carnegie Medal, 1936-1965.
He created several nonfiction books on southeastern England including some illustrated with his own photographs.
Crouch contributed numerous reviews of children's books to Junior Bookshelf, the Times Literary Supplement, and School Librarian.
He is commemorated by the Kent Arts and Libraries "Marcus Crouch Collection" of approximately 1,500 children's books that were published in the United Kingdom between 1830 and 1930.