The literature on the determinants of firms' financing constraints has paid little attention to gender as a determinant of access to finance. Using data for 34,342 firms from 90 developing countries, the paper analyzes the determinants of firms' financing constraints and assesses whether female-owned firms are more financially constrained than male-owned businesses. The results show that female-owned firms in sub-Saharan Africa are more likely to be financially constrained than male-owned firms, but there is no gender gap in other developing regions. The gender gap in sub-Saharan Africa is robust to variations in specifications and econometric estimation procedures.