The migration literature agrees on several key factors that motivate individual decisions to move: human capital investments, socioeconomic status, familial considerations, social networks, and local opportunities in places of origin relative to opportunities abroad. Yet further analysis of the social forces underlying these relationships reveals interwoven gender relations and expectations that fundamentally differentiate migration patterns, in particular who migrates and why. Data analysis of 14,000 individuals in 43 Mexican villages reveals several mechanisms through which the effects of gender play out in the migration process. Results suggest that migrant networks provide support to new men and women migrants alike, whereas high female employment rates reduce the likelihood that men, but not women, begin migrating. Education effects also emphasize the importance of examining gender differences. In keeping with the literature on Mexican migration, I find that men are negatively selected to migrate but, conversely, that higher education increases migration among women. My findings also question the narrow portrayal of women as associational migrants that follow spouses disclosing much greater chances of family, separation than reunification among migrants' wives and significantly higher migration risks for single and previously married women than married women.