The 13-item Negative Body Talk Scale (NBT scale; Engeln-Maddox et al., 2012) assesses women’s tendency to engage in negative, appearance-focused conversations about their body. The NBT scale can be administered online or in-person with adolescent and adult women and is free to use in any setting. This chapter first discusses the development of the NBT scale as well as the academic literature on the link between girls’ and women’s negative body talk and body satisfaction. Next, this chapter provides evidence of the psychometric properties of the NBT scale. Specifically, exploratory and confirmatory factor analyses conducted with samples of young adult, undergraduate women suggest a correlated two-factor structure (body concerns and body comparisons) for scores on the scale. Analyses of NBT scores from a large sample of U.S. college women (ages 18-35) indicated scalar (i.e., strong) invariance across three ethnic groups (Asian, Latina, and White). Internal consistency reliability, test-retest reliability, convergent validity, discriminant validity, and incremental validity support the use of the NBT scale. This chapter provides the NBT scale items, instructions for administering the measure to participants, the item response scale, and the scoring procedure. Logistics of use, such as permissions, copyright, and citation information, are also provided for readers.