Louisa Garrett Anderson, CBE was a medical pioneer, a member of the Women's Social and Political Union, a suffragette, and social reformer. She was the daughter of the founding medical pioneer Elizabeth Garrett Anderson, whose biography she wrote in 1939.

The Women's Social and Political Union (WSPU) was a women-only political movement and leading militant organisation campaigning for women's suffrage in the United Kingdom founded in 1903. Known from 1906 as the suffragettes, its membership and policies were tightly controlled by Emmeline Pankhurst and her daughters Christabel and Sylvia. Sylvia was eventually expelled.