Lillian May Armfield (1884 – 1971) was a pioneering Sydney female police detective, one of the first women to serve in that role. For most of her police career (1915 - 1949), it was known that she was the only N.S.W. Policewoman approved to carry a service revolver. In 1946, she received official acclaim for her life's work, receiving the King's Police and Fire Service Medal. She was awarded the Imperial Service Medal, ISM in 1949, when she retired from the police service aged sixty five.