This investigation used self-determination theory to study goal striving in the context of romantic relationships. The study explored how dyadic partners' relationship motivation impacted goal progress, personal well-being, and relationship satisfaction. In addition, the mediating role of relationship goal progress was explored.In a prospective longitudinal study, 153 heterosexual couples rated their own relationship motivation and each reported a relationship goal and a self-oriented goal. Goal progress was assessed approximately 1 year later. In addition, well-being and relationship satisfaction were assessed at baseline and follow-up.Actor-partner interdependence models revealed that actor's autonomous relationship motivation was positively associated with relationship and self-oriented goal progress. Actor's autonomous relationship motivation, as well as both actor and partner relationship goal progress, were associated with increases in actor's subjective well-being (SWB) and relationship satisfaction. Relationship goal progress mediated the association between actor's autonomous relationship motivation and SWB, as well as relationship satisfaction.Together, these findings contribute to research on relationship motivation and goal striving in dyadic partners, by suggesting that motivational regulations impact goal regulation in romantic relationships and associated well-being outcomes.