Childhood maltreatment is associated with poorer quality relationships and attachment theory has proffered an influential framework. The role of dyadic coping remains unclear and may play an integral role linking attachment insecurity and relationship quality among adults who experienced maltreatment. Using a sample of 177 adults (56.6% racial minority) were recruited from a southern university a serial mediational model was examined using structural equation modeling. Childhood maltreatment was linked with relationship quality through greater attachment avoidance and lower levels dyadic coping. Focusing on dyadic coping among avoidantly attached individuals from a trauma-informed perspective may be a point of clinical intervention.