Childrearing antecedents of Machiavellianism have been investigated, finding that cold, rejecting, and neglecting parenting is associated with Machiavellianism. However, there is a paucity of research on Machiavellianism and family functioning that is suggested to be a stronger predictor of children's adjustment than parenting. In two cross-sectional, self-report studies with 266 adolescents (115 boys) and 98 families raising adolescents (51 boys), we investigated the relationship between adolescent Machiavellianism and interparental functioning.