Eliza Mason Tupper Wilkes (October 8, 1844 – February 5, 1917) was an American suffragist and Unitarian Universalist minister.

[1] Tupper taught school in Mount Pleasant, Iowa as a young woman, hoping that her training as a teacher would prepare her for life as a Baptist missionary.

[12] Wilkes was honorary vice president of the National Woman Suffrage Association, representing South Dakota, in 1884.

[13] She split pulpit duties with Anna Howard Shaw and Eleanor Gordon at the 1905 national suffrage convention in Portland, Oregon.

She shared the platform with both Anthony and Shaw at the second annual Women's Congress in San Francisco in 1895,[14] and at a 1905 suffrage rally in Venice, California.

[17] Wilkes' grave in South Dakota[18] is not separately marked, but there is a historical marker about her life and work nearby.