Who was the first female supreme court justice?

Answer: Sandra Day O'Connor

Reagan appointed Sandra Day O’Connor in 1981 to the Supreme Court, making her the first female Justice. She stepped down from her position in 2006. Recently, O’Connor made headlines for her urging of President Barack Obama to fill the Supreme Court vacancy created by Justice Antonin Scalia’s death. - Inside Gov

She was born in El Paso, Texas, the daughter of Harry Alfred Day, a rancher, and Ada Mae (Wilkey). Her sister was Ann Day, who served in the Arizona Legislature. She grew up on a cattle ranch near Duncan, Arizona where she had to change automobile flat tires herself in dangerous environments.

She later wrote a book with her brother, H. Alan Day, Lazy B : Growing up on a Cattle Ranch in the American West (2002), about her childhood experiences on the ranch. For most of her early schooling, O'Connor lived in El Paso with her maternal grandmother, and attended school at the Radford School for Girls, a private school. She graduated sixth in her class at Austin High School in El Paso in 1946. She attended Stanford University, where she received her B.A. in economics in 1950. She continued at the Stanford Law School for her LL.B.. There, she served on the Stanford Law Review with its presiding editor in chief, future Supreme Court Chief Justice William Rehnquist, who was the class valedictorian, and whom she briefly dated during law school. She has stated that she graduated third in her law school class, although Stanford's official position is that the law school did not rank students in 1952.

O'Connor served as Assistant Attorney General of Arizona from 1965 to 1969 until she was appointed to fill a vacancy in the Arizona State Senate. She was elected to the State Senate in 1973 and became the first woman to serve as its Majority Leader. In 1974 she was elected to the Maricopa County Superior Court serving from 1975 to 1979 when she was elevated to the Arizona State Court of Appeals. She served on the Court of Appeals-Division One until 1981 when she was appointed to the Supreme Court.