The present study provided a novel examination of how children's theory of mind (ToM) might be related to two maternal beliefs: (1) social dominance orientation (SDO: the belief that inequalities in society are justified) and (2) right-wing authoritarianism (RWA: a belief in following established authorities). We reasoned that these beliefs could affect maternal talk in that mothers with high SDO and RWA would be less likely to use mental state (MS) talk to explore peoples' desires and feelings, particularly when talking about individuals of an outgroup (e.g., of a different ethnicity). As a consequence, there might be links between maternal beliefs and children's ToM. We measured SDO and RWA in mothers, gave children theory-of-mind tasks, and measured the MS talk of 79 New Zealand mothers when asked to describe pictures to their 2- to 5-year-olds. Mothers with high SDO and RWA provided less MS talk when describing individuals of a different ethnicity, and mothers with high SDO and RWA had children with a worse ToM. The present findings provide unique information regarding the role of parent beliefs in children's ToM.