It is important that scales that evaluate body image and related attitudes and behaviors are both reliable and valid to evaluate these constructs in different countries. This paper introduces a series of five papers that examine the measurement invariance of multiple scales for men and women across eight countries (Australia, Belgium, Canada, China, Italy, Japan, Spain, and the US). The papers examined measures of: sociocultural influences (i.e., appearance-related pressures) on strategies to lose weight/increase muscle; internalization of the thin/muscular ideal; body image; personality constructs; body change strategies to increase muscles and lose weight; and eating regulation. Measurement invariance was generally well-established across the eight countries. One or more items were removed in some scales for some countries to establish invariance. Factor loadings were equivalent across countries and refined scales demonstrated acceptable levels of reliability. The most frequent difference in the scales was in the item intercepts across groups, although most item intercepts were equivalent across groups. This series of papers makes an important contribution to the body image literature by demonstrating the validity of measures of body image, disordered eating, and sociocultural factors that can be used to better understand the relationship between these variables across different countries.