Mary Margaret Bartelme (July 24, 1866 – July 25, 1954) was a pioneering American judge and lawyer, particularly in the area of juvenile justice. She was the first woman appointed Cook County Public Guardian in Illinois in 1897, and the first woman elected judge in a court of high jurisdiction in the state in 1923. Earlier, appointed a judge assistant in 1913, she began hearing court cases involving juveniles and was referred to at that time as, "America's only woman judge", by The New York Times.