This article describes the development and the initial psychometric evaluation of the Social Issues Advocacy Scale in two studies. In the first study, an exploratory factor analysis (n = 278) revealed a four-factor scale, accounting for 71.4% of the variance, measuring different aspects of social issue advocacy: Political and Social Advocacy, Confronting Discrimination, Political Awareness, and Social Issue Awareness. The second study (n = 509) supported the structure. Results indicated excellent internal reliability and associations with another social advocacy scale, political interest, and multicultural empathy, but not with self-esteem and life satisfaction; all of which provided initial evidence of construct and discriminant validity. (Contains 4 tables.)