The 69-item Multidimensional Body-Self Relations Questionnaire (MBSRQ; Cash et al., 2004) assesses respondents’ body attitudes toward their appearance-related features and body competence-related features (e.g., fitness, health). It contains nine subscales: appearance evaluation, appearance orientation, fitness evaluation, fitness orientation, health evaluation, health orientation, body areas satisfaction, overweight preoccupation, and self-classified weight. Yet, many body image researchers elect to use only the appearance-related subscales (AS): appearance evaluation, appearance orientation, body areas satisfaction, overweight preoccupation, and self-classified weight. The MBSRQ can be administered online or in-person to adolescents or adults; it is free to use. This chapter first discusses the development of the MBSRQ and then provides evidence of its psychometrics. More specifically, factor analyses have supported the MBSRQ-AS’s factor structure, internal consistency reliability, test-retest reliability, and construct validity. Next, this chapter provides all MBSRQ items, the item response scale, and instructions for its administration and scoring. Links to known translations are provided. Logistics of use, such as permissions, copyright, and contact information, are provided for readers.