And Both Were Young is a novel by Madeleine L'Engle originally published in 1949. It tells the story of an American girl at boarding school in Switzerland, not long after World War II, and the relationship she develops with a French boy she meets there, who cannot remember his past due to trauma he suffered in the war.

Madeleine L'Engle was an American writer of fiction, non-fiction, poetry, and young adult fiction, including A Wrinkle in Time and its sequels: A Wind in the Door, A Swiftly Tilting Planet, Many Waters, and An Acceptable Time. Her works reflect both her Christian faith and her strong interest in modern science.