Who was the first female Supreme Court Justice?

The first female Supreme Court Justice was Sandra Day O'Connor. Appointed by President Ronald Reagan in 1981, she made history as the first woman to serve on the U.S. Supreme Court. O'Connor's appointment marked a significant milestone in the representation of women in the judiciary, paving the way for future female justices. Her influence on the court was notable, as she often served as a swing vote on many important decisions, demonstrating the vital role she played in shaping legal interpretations on issues such as reproductive rights, affirmative action, and government church-state relations. The other justices listed did serve on the Supreme Court, but they did so after O'Connor, making her the pioneering figure in this context.