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Interpersonal power involves how much actors can influence partners (actor power) and how much partners can influence actors (partner power). Yet, most theories and investigations of power conflate the effects of actor and partner power, creating a fundamental ambiguity in the literature regarding how power shapes social behavior. We demonstrate that actor and partner power are distinct and have differential effects on social behavior. Six studies (total N= 1,787) tested whether actor and partner power independently predicted behavioral inhibition (expressive suppression) and communal behavior (prioritization of partners’ needs) within close relationships, including during couples’ daily life (Study 1), lab-based social interactions (Studies 1–5; 1,012 dyadic interactions), and general responses during conflict (Studies 5 and 6). Actor power was negatively associated with behavioral inhibition, indicating that …