The 20-item Body Dissatisfaction Frequency Duration Questionnaire (BDFDQ; Dondzilo et al., 2022) separately assesses two dimensions of trait body dissatisfaction: the frequency with which one experiences episodes of dissatisfaction with their shape and/or weight (i.e., body dissatisfaction frequency) and the duration of such episodes (i.e., body dissatisfaction duration). The BDFDQ can be administered online and/or in-person to adults and is free to use in any setting. This chapter first discusses the development of the BDFDQ and then provides evidence of its psychometrics. More specifically, the BDFDQ has been found to have a two-factor structure (body dissatisfaction frequency and body dissatisfaction duration) within confirmatory factors analyses and invariance across gender. Internal consistency reliability, convergent validity, divergent validity, and predictive validity support the use of the BDFDQ. Next, this chapter provides the BDFDQ items in their entirety, instructions for administering the BDFDQ to participants, the item response scale, and the scoring procedure. Logistics of use, such as permissions, copyright, and contact information, are provided for readers.