The Development Centre of the Organisation for Economic Co-operation and Development's Gender, Institutions and Development Data Base (GID-DB) is a new cross-country research tool with comprehensive measures of gender equality. It improves upon existing sources because it is the only data base on gender that systematically incorporates indicators of social norms, traditions and family law. The GID-DB thereby permits analysis of hypotheses that link cultural practices to gender equality, human development and economic growth. A cross-country comparison of the data indicates that inequalities in social institutions are particularly pronounced in countries with low female literacy rates, but correlate less strongly with Gross Domestic Product per capita. Similarly, our econometric analysis suggests a clearly negative correlation between gender inequality of the OECD Development Center and women's labor-force participation.*The views expressed in this article are the personal opinions of the authors