Studies have found that low marital satisfaction, parenting stress, and child behavior problems are linked in families of children with developmental delays (DD). However, previous investigations examining the relationships between parenting stress, child behavior problems, and marital satisfaction rarely examine the interrelationships of these three variables simultaneously, and the samples used are often restricted in terms of age and ethnicity, limiting generalizability. The primary aim of the study was to examine the associations between marital satisfaction, child behavior problems, and parenting stress in a diverse sample of parents of young children with DD. The study included 44 parents of children ages 2.5 to 5 years with DD and high levels of behavior problems who participated in a larger study looking at the impact of Mindfulness-Based Stress Reduction (MBSR) in reducing parenting stress and child behavior problems. Marital satisfaction was significantly related to both parenting stress and child behavior problems, where parents with lower marital satisfaction reported higher parenting stress and child behavior problems. Additionally, preliminary analyses indicated that marital quality significantly moderated changes in child behavior problems from pre- to posttreatment but did not moderate changes in parenting stress as a result of the MBSR intervention.