The 12-item Intuitive Eating Scale-3 (IES-3; Tylka et al., 2024) assesses intuitive eating, or being connected to internal hunger, satiety, and appetitive cues and flexibly using these cues to determine when, what, and how much to eat. The IES-3 can be administered online or in-person and is free to use in any setting. This chapter first discusses the development of the IES-3 and then provides evidence of its psychometrics. More specifically, the IES-3 has been shown to have a general IE factor and four specific factors (unconditional permission to eat, eating for physical rather than emotional reasons, reliance on internal hunger and satiety cues, body-food choice congruence) via bifactor exploratory structural equation modeling. The IES-3 was found to be invariant across gender and lacked measurement bias across gender, age, and BMI. Internal consistency reliability, test-retest reliability, convergent validity, discriminant validity, and incremental validity support the use of the IES-3. Next, this chapter provides the IES-3 items in their entirety, instructions for administering it to participants, the item response scale, and the scoring procedure. Logistics of use, such as permissions, copyright, and contact information, are available for readers.