The purpose of this article is to review research on the construction of gender ideology and its consequences. The article begins with a summary of research focused on measuring gender ideology—individuals' levels of support for a division of paid work and family responsibilities that is based on the belief in gendered separate spheres. We describe the ways this concept has been operationalized in widely available data sources and provide a categorization schema for the items used to measure gender ideology. We also review the research predicting gender ideology, focusing on social and demographic characteristics while concurrently examining studies using cross-sectional, trend, and panel data. Finally, this article summarizes research focused on the consequences of gender ideology, both in families and family-related behaviors and in other areas of social life where beliefs about gender are relevant, such as the workplace. We conclude with implications for future research for measurement tools, predictors of gender ideology, and consequences of ideology in individuals' lives.