Jeannette Ridlon Piccard ( jə-NET pih-KAR; January 5, 1895 – May 17, 1981) was an American high-altitude balloonist, and in later life an Episcopal priest. She held the women's altitude record for nearly three decades, and according to several contemporaneous accounts was regarded as the first woman in space.

Piccard was the first licensed female balloon pilot in the U.S., and the first woman to fly to the stratosphere. Accompanied by her husband, Jean—a member of the Piccard family of balloonists and the twin brother of Auguste Piccard—she reached a height of 10.9 miles (17.5 km) during a record-breaking flight over Lake Erie on October 23, 1934, retaining control of the balloon for the entire flight. After her husband's death in 1963, she worked as a consultant to the director of NASA's Johnson Space Center for several years, talking to the public about NASA's work, and was posthumously inducted into the International Space Hall of Fame in 1998.

From the late 1960s onwards, Piccard returned to her childhood interest in religion. She was ordained a deacon of the Episcopal Church in 1971, and on July 29, 1974, became one of the Philadelphia Eleven, the first women to be ordained priests—though the ordinations were regarded as irregular, performed by bishops who had retired or resigned. Piccard was the first of the women to be ordained that day, because at 79 she was the oldest, and because she was fulfilling an ambition she had had since she was 11 years old. When asked by Bishop John Allin, the head of the church, not to proceed with the ceremony, she is said to have told him, "Sonny, I'm old enough to have changed your nappies." In September 1976, the church voted to allow women into the priesthood, and Piccard served as a priest in Saint Paul, Minnesota, until she died at the age of 86. One of her granddaughters, Kathryn Piccard, also an Episcopal priest, said of her: "She wanted to expand the idea of what a respectable lady could do. She had the image of the street-wise old lady."