This longitudinal study considers the effect of parent-child attachment on the self-regulation of children. Four hundred and forty-eight families from the Northwestern U.S. were surveyed as part of Brigham Young University's Flourishing Families Project. Each family studied included a child between the ages of 11 and 13. Couple conflict and the child's attachment to parents were assessed at time 1 and the child's self-regulation was assessed each year thereafter for three years. Higher couple conflict predicted lower attachment to father and to mother at time 1 with a greater negative effect for fathers. Higher scores on attachment to father predicted greater initial levels of child self-regulation (at time 2) but not slopes of child self-regulation. Model results suggest that father attachment mediates the link between couple conflict and initial levels of self-regulation. This model accounted for 40% of the variation in child self-regulation measured at one year.