Do non-cognitive traits contribute to the gender gap in supervisory status and promotion? We use a large linked employer-employee dataset collected from six former socialist countries to assess the link between non-cognitive traits and upward mobility. Controlling for on workplace heterogeneity, we find that gender differences in locus of control, the preference for challenge versus affiliation, and adherence to work ethic together can explain about 7–18% of the gender gap in supervisory status and promotions Overall, non-cognitive traits provide an important, though incomplete, explanation for the gender gap in upward mobility