A large and coherent body of evidence reveals that high dispositional mindfulness is a positive personal resource, yet remarkably little is known about the origins of individual differences in mindfulness. Attachment theory describes how early experiences with caregivers shape psychosocial development across the lifespan. Drawing from attachment theory, we propose that those who have received sensitive and responsive caregiving in childhood are more likely to have a secure attachment style which may, in turn, provide greater capacity for mindfulness. In an adolescent sample attending a large urban university (Study 1), there were indirect effects of parental rejection and parental warmth on mindfulness via attachment anxiety and avoidance. In Study 2 we tested the same hypotheses in a group of adolescent high school students and replicated the above pattern of results. In brief, both retrospective reports (Study 1) and current reports (Study 2) of the quality of parenting received were associated with individual differences in mindfulness via attachment processes. This research suggests that the origins of individual differences in dispositional mindfulness may have their roots in early childhood experiences.