In this review, we explore how bicultural competence, or the extent to which individuals effectively balance two cultures, can exist at a dyadic level, where two individuals’ respective levels of cultural competence determine how effectively the dyad engages with their environment and collectively manages challenges associated with navigating two cultures. We review existing literature relevant to this concept, which we call dyadic bicultural competence, focusing on intimate partners. Research in this area is limited, and there have been mixed findings regarding how partners’ cultural competencies relate to relationship functioning. We propose a model based on established models of relational strain and culture in family dynamics, explaining how dyadic bicultural competence can be associated with relationship trajectories. This proposed model provides a framework that explains mixed findings in this area and may be helpful in guiding future work exploring the role of cultural competence in individual and relational functioning for migrants.