Mabel Vernon (September 19, 1883 – September 2, 1975) was an American suffragist, pacifist, and a national leader in the suffrage movement in the United States. A Quaker and a member of the National American Woman Suffrage Association, Vernon was inspired by the methods used by the Women's Social and Political Union in the United Kingdom. She was one of the principal members of the Congressional Union for Woman Suffrage, and helped to organize the Silent Sentinels' protests that involved daily picketing of Woodrow Wilson's White House. This photograph of Vernon was taken around 1917, the year in which she was elected the secretary of the National Woman's Party, and became one of the first six women to be arrested while picketing the White House, under charges of "obstructing the traffic". They were each ordered to pay a $25 fine or spend three days in jail; all of the women insisted they were innocent and refused to pay the fine.

Photograph credit: Edmonston; restored by Adam Cuerden