This study sought to model and test the role of parental catastrophizing in relationship to parent-reported child pain behavior and parental protective (solicitous) responses to child pain in a sample of children with Inflammatory Bowel Disease and their parents (n = 184 dyads). Parents completed measures designed to assess cognitions about and responses to their child's abdominal pain. They also rated their child's pain behavior. Mediation analyses were performed using regression-based techniques and bootstrapping. Results supported a model treating parent-reported child pain behavior as the predictor, parental catastrophizing as the mediator, and parental protective responses as the outcome. Parent-reported child pain behavior predicted parental protective responses and this association was mediated by parental catastrophizing about child pain: indirect effect (SE) = 2.08 (0.56); 95% CI = 1.09, 3.30. The proportion of the total effect mediated was 68%. Findings suggest that interventions designed to modify maladaptive parental responses to children's pain behaviors should assess, as well as target, parental catastrophizing cognitions about their child's pain.