Is there an equal share of men and women working in the fields of science, technology, engineering and mathematics (or STEM)? Do girls and boys in school have preconceived biases about whether they should pursue these subjects? To celebrate International Women’s Day and as part of the OECD March on Gender initiative, Caitlyn Guthrie, Advisor in the OECD’s Directorate for Education and Skills, and Raffaella Centurelli, Advisor in the OECD Directorate for Science, Technology and Innovation, discuss gender imbalances in the STEM fields, both in school and in the job market, suggesting workable ways to reduce gender inequity and promote equal opportunities for all.