This article describes the development and psychometric evaluation of the Gender-Equitable Men (GEM) Scale, a twenty-four-item scale to measure attitudes toward gender norms among young men. The selected key domains on gender norms, or scale items, are developed and relate to sexual and reproductive health, sexual relations, violence, domestic work, and homophobia. It was found that more support for equitable norms (i.e., higher GEM Scale scores) is significantly associated with less self-reported partner violence, more contraceptive use, and a higher education level.