Elizabeth Williams Berry, who became known as Mother Berry some time after 1900, was an Australian-born jockey who rode in multiple nations disguised as a man, using the name Jack Williams. After moving to the United States about 1900, she married, and gained the nickname "Mother" after being granted custody of a runaway boy. She retired from jockeying to become a horse trainer. Berry and her husband settled in Helena, Montana, where Berry lived until her death in 1969.