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Existing structural analyses of emotion-regulation (ER) strategies have relied on retrospective, dispositional assessments, ignoring the within-person structure (i.e., intraindividual strategy groupings based on momentary covariances) and variability in strategy use across time and contexts. We conducted multilevel exploratory factor analyses on self-reported daily use of 11 strategies (i.e., acceptance, behavioral avoidance, distraction, experiential avoidance, expressive suppression, procrastination, reappraisal, reflection, rumination, savoring, social support) in clinical (N = 129) and student (N = 109) samples with intensive longitudinal designs. At the between-person level, two factors—Engagement and Avoidance—emerged in both samples. A different structure was found at the within-person level, with four factors in the student sample (i.e., Attentional Shift, Acceptance, Avoidance, Emotional Expression) and three …