Lillias Anna Hamilton (7 February 1858 – 6 January 1925) was a British doctor and author. She was born at Tomabil Station, New South Wales to Hugh Hamilton (1822– 1900) and his wife Margaret Clunes (née Innes). After attending school in Ayr and then Cheltenham Ladies' College, she trained first as a nurse, in Liverpool, before going on to study medicine in Scotland, qualifying as a Doctor of Medicine in 1890.