Although women now earn more than half of all college degrees, they remain deeply segregated from men across occupations. This study offers new insights into gender inequality in the labor market by examining the impact of field of study and gender on occupational sex segregation among college graduates in the United States. Using nationally representative data, I find that women and men’s uneven distribution across fields of study in higher education contributes about 36% to occupational segregation as measured by the Dissimilarity index (D). However, the gender differences in returns to college majors account for a negligible proportion of D. The gender structure in occupational sorting net of field of study and socio-demographic characteristics contributes significantly – about half of D – to occupational segregation. Lastly, my results suggest that women and men are more likely to be in different occupations if from fields that link strongly to occupational destinations.