Susan Ertz (1894 – 11 April 1985) was a British fiction writer and novelist, known for her "sentimental tales of genteel life in the country." She was born in Walton-on-Thames, Surrey, England to American parents Charles and Mary Ertz. She moved back and forth between both countries during her childhood but chose to live in the UK when she was 18. She married British Army officer Major John Ronald McCrindle, British barrister; in London in 1932.
A common theme running through her work involves a female character "who is thrust out on her own from a sheltered environment into a vaguely hostile external world with which she is initially unprepared to cope. Her coming to terms with this hostile world provides the fictional interest of [her] novels." The Proselyte, the story of a London woman who marries a Mormon missionary and moves with him to Utah, was one of her most highly praised books (even Mormons felt that in "her story the hardships and sorrows of the people are clearly portrayed"). Ertz's Woman Alive is a science fiction novel set after all women other than the titular heroine have perished in a plague.  
- Madame Claire 1923
- Nina 1924
- After Noon 1926
- The Wind of Complication (short stories) 1927
- Now East, Now West 1927
- The Milky Way 1929 (under the name, The Galaxy, this book was on the U.S. best seller fiction list for 1929.)
- The Story of Julian 1931
- The Proselyte 1933
- Now We Set Out 1935
- Woman Alive, But Now Dead 1935
- No Hearts to Break 1937
- Black, White and Caroline 1938
- Big Frogs and Little Frogs (short stories) 1939
- One Fight More 1939
- Anger in the Sky 1943
- Mary Hellam 1947
- The Prodigal Heart 1950
- The Undefended Gate 1953 (published in the U.S. as Invitation to Folly)
- Charmed Circle 1956
- In the Cool of the Day 1960
- Week Long Summer's Lease 1972
- The Philosopher's Daughter 1976
- Contemporary Authors, Thomson Gale, August 2003. ISBN 0-7876-6635-1
- Levi E. Young quoted in Sunday Lit Crit Sermon: Levi Edgar Young’s Literary Acquaintances by Kent Larsen, A Motley Vision, May 20, 2012. Accessed May 21, 2012.
- Judith Merril, "What do you Mean? Science? Fiction?" in Thomas D. Clareson, SF: The Other Side of Realism. Popular Press, 1971. ISBN 0879720239, (p. 77).
- Maria Aline Seabra Ferreira, I Am The Other: Literary Negotiations Of Human Cloning Contributions to the study of science fiction and fantasy, Greenwood Publishing Group, 2005. ISBN 0313320063 (p.73).
- Bibliographic information from:Bleiler, Everett (1948). The Checklist of Fantastic Literature. Chicago: Shasta Publishers. p. 102.