Elizabeth "Sadie" Holloway Marston (February 20, 1893 – March 27, 1993) was an American psychologist. She was involved in various ways in the creation of the comic book character Wonder Woman in the early 1940s with her husband, William Moulton Marston (pen name Charles Moulton). She also participated with Marston in the development of the systolic blood-pressure test used to detect deception.