Lenore Guinzberg Marshall (September 7, 1899, New York City – September 23, 1971, Doylestown, Pennsylvania) was an American poet, novelist, and activist.
She was the daughter of Harry and Leonie (Kleinert) Guinzburg. She graduated from Barnard College in 1919.
She married James Marshall, son of famed New York lawyer, Louis Marshall. Lenore and James had two children, Ellen and Jonathan; they lived in New York City. James served on the Board of Education in New York City for seventeen years, including as its president. He called for the creation of UNESCO during World War II.
From 1929 to 1932, Lenore Marshall worked as an editor at Cape and Smith, where she was instrumental getting them to publish The Sound and the Fury by William Faulkner. She also edited As I Lay Dying.
Her work appeared in Harper's, and The New Yorker.
In 1933, she became the treasurer of the Writers' League Against Lynching, and corresponded with Theodore Dreiser, who was a member, and who wrote the anti-lynching story "Nigger Jeff".
In 1956, with Norman Cousins, she helped found SANE, the National Committee for a Sane Nuclear Policy. She continued her anti-nuclear work with the Committee for Nuclear Responsibility. She corresponded with Irving Howe.