Gertrud Johanna Woker (16 December 1878 – 13 September 1968) was a Swiss suffragette, biochemist and toxicologist, and peace activist.

Leading a double life proved to be an exhausting and Woker fell ill with chlorosis, a form of anaemia.

[1] Woker went on to obtain her PhD and school teaching qualification in chemistry, physics and botany from the University of Berne.

[3] Upon her return to Bern, Woker was unable to find a position in her field and became a high school gymnastics teacher.

[3] In her lab, she conducted studies on peroxidase and catalase, detection methods for natural products and in particular color reactions on sterols.

[8] In 1925, Woker published "The coming war of Poison Gas" and sent appeals to Women's International League for Peace and Freedom.