This document discusses using openness and open educational resources (OER) to help mitigate gender inequality in STEM education. It provides context on current research showing factors that influence fewer women in STEM like implicit bias, self-efficacy, and historical stereotypes. Contemporary STEM initiatives from around the world aim to increase women in STEM but more work is needed. The principles of open education could help by providing flexible learning opportunities, open virtual labs, reducing costs, and addressing local contexts. A framework is proposed with four components: regulatory policies and standards, research and innovation, practice of open pedagogy, and enablers like role models and peer support, to support women in STEM through open education.