Numerous studies examined the association between character strengths—positive traits that comprise a good personality—and satisfaction with different aspects of life. However, few studies explored the connection between character strengths and marital satisfaction. The present study, conducted on a sample of 177 married couples, aims to examine this connection. Given the findings of previous studies, showing that both spouses’ personality traits contribute to relationship quality, we expect to find a connection between the spouses’ strengths and their marital quality. Using actor-partner interdependence model analyses, we examined the effects of three strengths factors (caring, self-control, and inquisitiveness) of both the individual and the partner on marital quality, evaluated by indices measuring marital satisfaction, intimacy, and burnout. Our findings revealed that the individual’s three strengths factors were related to all of his or her marital quality indices (actor effects). Moreover, women’s caring, inquisitiveness and self-control factors were associated with men’s marital quality, and men’s inquisitiveness and self-control factors were associated with women’s marital quality (partner effects). Our findings join the efforts of previous studies to understand the association between character strengths and the various elements of mental well-being, especially romantic relationships.