Phyllis Evelyn Duguid OAM (16 October 1904 – 9 March 1993), née Lade, was an Australian teacher and Aboriginal rights and women's activist, who was highly regarded for her long-term commitment to those she saw as members of an underclass in society. She was married to, and often worked alongside, Charles Duguid, medical practitioner and Aboriginal rights campaigner, the couple leading much of the work on improving the lives of Aborigines in South Australia in the mid-twentieth century. She founded the League for the Protection and Advancement of Aboriginal and Half-Caste Women, which later became the Aborigines' Advancement League of South Australia (AALSA).