The postpartum period involves profound bodily, psychological, and relational changes that may challenge women’s well-being and couple functioning, yet the role of flows of compassion and positive body image in postpartum relational outcomes remains largely unexplored. The present study examined whether body appreciation mediates the associations between different flows of compassion (self-compassion, compassion toward others, and compassion from others) and couple satisfaction in postpartum women. A total of 230 Italian postpartum women who had given birth in the previous six months (Mage = 33.65, SD = 4.43) completed online self-report measures assessing self-compassion, compassion toward others, compassion from others, body appreciation, and couple satisfaction. Direct and indirect associations among compassion flows, body appreciation, and couple satisfaction were examined using path analysis, controlling for breastfeeding status. Self-compassion and compassion from others were positively associated with body appreciation, which in turn was positively associated with couple satisfaction; compassion from others also showed a direct positive association with couple satisfaction, and significant indirect effects of self-compassion and compassion from others on couple satisfaction through body appreciation were observed. Body appreciation may represent a key psychological mechanism through which compassion-based processes support relational well-being in the postpartum period. This study is the first to examine the mediating role of body appreciation in the relationship between compassion flows and couple satisfaction in postpartum women. Integrating compassion flows with positive body image advances understanding of how intrapersonal and interpersonal emotional resources contribute to couple satisfaction following childbirth and informs interventions aimed at supporting postpartum adjustment.