This chapter describes the development, validation, and translation of the Interpersonal Mindfulness in Parenting (IM-P) scale, a self-report questionnaire measure designed to assess the frequency of parents’ everyday practice of mindful parenting skills. The IM-P contains items that are based on a theoretical model of mindful parenting that extends dispositional mindfulness to the interpersonal domain of parent-child interactions. The original English-language version of the IM-P contained 10 items to assess three subscales and was later expanded to include 31 items to better capture five hypothesized domains of mindful parenting: listening with full attention, emotional awareness of self and child, self-regulation in parenting, nonjudgmental acceptance in parenting, and compassion for self and child. The IM-P has been shown to be sensitive to change when used in intervention research and linked with observational data on parent-youth interactions. Efforts to translate and culturally adapt the IM-P for other languages and cultures are underway, with published studies currently available on Dutch, Korean, Hong Kong Chinese, and Portuguese versions and with French, Hebrew, Indonesian, Japanese, Spanish, and Urdu versions forthcoming, among others. Subscale factor structures vary somewhat for each of these versions, with differentiation of child-oriented and parent-oriented items. A modified IM-P for parents of infants has also been shown to relate to mother and baby stress physiology. Versions of the IM-P have been administered in paper and pencil, online survey, and interview format with adults with a range of formal educational experience. The instrument has been extended to assess interpersonal mindfulness in couple relationships and teaching, and there is a youth-report version.