The ability to effectively cope with stress is impacted by early relationship experiences and, thus, is related to attachment security. We examined how different forms of attachment insecurity (namely, attachment anxiety and attachment avoidance) impact romantic partners’ capacity for coping with stress individually (via self-regulation) and together (via dyadic coping) in a community sample of 261 heterosexual couples. We also explored links between these coping strategies and measures of well-being. Multiple regression analyses in this cross-sectional, self-report study indicated that attachment avoidance, but not anxiety, was linked to less effective dyadic coping. In men, this was also the case for partner’s attachment avoidance. Attachment anxiety, but not avoidance, was related to self-regulation problems for women, while in men, both facets of attachment insecurity were negatively associated with self-regulation. Individual and dyadic coping strategies each uniquely contributed to individuals’ well-being and satisfaction with life. Relationship interventions and counseling processes might benefit from sensitizing clients for biographical influences on their coping strategies.