Health-promoting behaviors have been shown to enhance the quality of life across diverse populations. In this study, we examined the indirect effects of several health-promoting behaviors on the relationship between parenting stress and health-related quality of life in mothers of children with cerebral palsy (CP). A convenience sample of Korean mothers (N = 180) of children aged 10 months to 12 years with CP was recruited from clinical and school settings. Health-promoting behaviors were measured using the health-promoting lifestyle profile II, which is comprised of six subscales: health responsibility, physical activity, nutrition, spiritual growth, interpersonal relations, and stress management. Multiple mediation analyses were conducted to examine the mediating role of these behavioral categories. Spiritual growth (β = .56, p < .05) had an indirect effect on the relationship between parenting stress and physical health-related quality of life while spiritual growth (β = −1.00, p < .01) and stress management (β = −.80, p < .05) were found to mediate the association between parenting stress and mental health-related quality of life. The findings of multiple mediation analyses provide evidence of the influence of specific health-promoting behaviors on health-related quality of life, thereby informing the development of intervention programs for mothers of children with disabilities. K E Y W O R D S family caregivers of children with a disability, health-promoting behaviors, health-related quality of life, multiple mediation model, parenting stress 1 | INTRODUCTION Cerebral palsy (CP) is one of the most common childhood physical disabilities (Graham et al., 2016), with incidence rates ranging from 1.5 to more than 4 per 1,000 live births (Maenner et al., 2016; Van Naarden Braun et al., 2015). Children with CP exhibit a set of functional restrictions stemming from disorders of the developing central nervous system (Rosenbaum, 2003). Although the impaired motor function is the main clinical feature, many children with CP also experience sensory, intellectual, and communication impairments that restrict daily activities, including feeding and dressing (Raina et al., 2005). As such, children with significant and chronic disabilities, such as CP, require substantial support and have greater dependence, possibly long term, on caregivers (Fujiura, 2014). Raising a child with CP may increase the likelihood of chronic stress associated with caregiving, thus warranting additional research to identify factors that may improve coping and adjustment in this underserved population.