Objectives <p>Body awareness (BA) is a multifaceted construct defined as attending to and being aware of body sensations. It can be adaptive or maladaptive depending on one’s attitude. Adaptive BA, characterized by a mindful attitude, has been associated with greater well-being and reduced psychological symptom severity. Despite its importance in mental health and interventions, there are no questionnaires measuring adaptive BA specifically designed for adolescents and young adults (AYAs). This research therefore aimed to develop a brief BA questionnaire tailored to AYAs (ages 14–24&#xa0;years).</p> Method <p>To achieve this aim, we: (1) conducted focus groups with AYAs and psychologists working with this age-group, to gain insights into the dimensionality of BA in this population, (2) drafted a questionnaire and pilot tested it to assess item comprehension (<i>n</i> = 30), (3) refined the questionnaire using exploratory factor analysis (<i>n</i> = 454), and (4) evaluated the psychometric properties of the questionnaire in a large sample of AYAs (<i>n</i> = 752).</p> Results <p>The research resulted in an 18-item questionnaire called the Mindful Body Awareness Questionnaire (MBAQ) consisting of three dimensions with sound psychometric properties: equanimity (i.e., relating to body sensations in a non-judgmental, open, and non-reactive way), listening (i.e., approaching body sensations and considering them important sources of information), and non-avoidance (i.e., facing rather than avoiding body sensations).</p> Conclusions <p>The MBAQ demonstrates good psychometric properties and offers a developmentally appropriate tool for assessing adaptive BA in AYAs. It may support research and clinical practice by enabling reliable assessment of different facets of adaptive BA.</p>