INTRODUCTION: Paternal postnatal depression (PND) and its likely adverse impact on child development are receiving increased attention. However, research that examines processes transmitting risks of paternal PND to adverse child outcomes remains limited. METHODS: This study examines pathways from paternal PND (Edinburgh Postnatal Depression Scale; 8 months) to child emotional and behavioral development (Strengths and Difficulties Questionnaire; 7 years) through paternal parenting confidence, warmth, and father-child conflict (birth-4 years) in a UK-based birth cohort, the Avon Longitudinal Study of Parents and Children (N = 9,628). Analyses were adjusted for socioeconomic, familial, parental, and child characteristics, including maternal PND during early postnatal period. RESULTS: Adjusted models revealed evidence of total associations between paternal PND, child emotional symptoms, peer problems, and hyperactivity (albeit with wide 95% CIs), but not conduct problems. Indirect effects emerged from paternal PND to child emotional symptoms, hyperactivity, and peer problems through the combination of all paternal parenting factors, with no evidence of direct effects. Specificity analyses revealed indirect effects through paternal parenting confidence and father-child conflict in the associations between paternal PND and child emotional symptoms, hyperactivity, and peer problems (albeit with wide 95% CIs). CONCLUSIONS: Targeted intervention to increase paternal parenting confidence and decrease father-child conflict may improve outcomes in children whose fathers experience postnatal depression.