Mary Louisa Gordon (15 August 1861 − 5 May 1941) was a British physician, prison inspector and author. After graduating from the London School of Medicine for Women in 1890, Gordon worked at the East London Hospital for Children, the Evelina London Children's Hospital, and later had a private practice in Harley Street. While working as a physician, she made a number of public addresses and wrote publications on topics including the effects of prostitution and alcohol dependence on women.