Otto Rank (; German: [?a?k]; né Rosenfeld; 22 April 1884 – 31 October 1939) was an Austrian psychoanalyst, writer, and teacher.
Born in Vienna, he was one of Sigmund Freud's closest colleagues for 20 years, a prolific writer on psychoanalytic themes, the editor of two eminent analytic journals of the era, the managing director of Freud's publishing house, and a creative theorist and therapist.
In 1926, Rank left Vienna for Paris, and for the remainder of his life, he led a successful career as a lecturer, writer, and therapist in France and the United States.