There is a great deal of research, spanning social psychology, sociology, and political science, on politically relevant attitudes toward women and the influence of gender on individual’s political decision making. First, there are several measures of attitudes toward women, including measures of sexism and gender role attitudes, such as the Attitudes Toward Women Scale, the Old-Fashioned Sexism Scale, the Modern Sexism Scale, and the Ambivalent Sexism Inventory. There are advantages and disadvantages of these existing measures. Moreover, there are important correlates and consequences of these attitudes. Correlates include education level and the labor force participation of one’s mother or spouse. The consequences of sexist and non-egalitarian gender role attitudes include negative evaluations of female candidates for political office and lower levels of gender equality at the state level. Understanding the sources and effects of attitudes toward women is relevant to public policy and electoral scholars. Second, gender appears to have a strong effect on shaping men’s and women’s attitudes and political decisions. Gender differences in public opinion consistently arise across several issue areas, and there are consistent gender differences in vote choice and party identification. Various issues produce gender gaps, including the domestic and international use of force, compassion issues such as social welfare spending, equal rights, and government spending more broadly. Women are consistently more liberal on all of these policies. On average, women are more likely than men to vote for a Democratic Party candidate and identify as a Democrat. There is also a great deal of research investigating various origins of these gender differences. Comprehending when and why gender differences in political decision making emerge is important to policymakers, politicians, the political parties, and scholars.