Although parental sensitivity is an established determinant of children's attachment security, effect sizes are modest, suggesting other aspects of parenting that might support secure attachment. Parental emotion socialization (ES) has been proposed as a parenting domain that is theoretically linked to secure parent-child attachment. The goal of this meta-analysis was to evaluate the strength of the relations between parental ES and attachment security in children under the age of 18. We conducted three meta-analyses assessing the links of supportive parental ES, nonsupportive parental ES, and parental elaboration with attachment security assessed with behavioral, representational, and questionnaire measures (