AbstractObjectiveGuided by Gottman's framework of marital stability and the ecological theories, the present study aims to understand the relationships between work–family spillover and marital stability within two levels of context—the relational and social cultural contexts.BackgroundThe relational context of marriage is manifested by spousal relationships—spousal support and strain, which would moderate the relationship between work–family spillover and marital stability. Identified relationships also unfold within sociocultural contexts.MethodThis study uses data from the Midlife in the United States 2 (MIDUS 2) and Midlife in Japan (MIDJA) projects to explore these dynamics. The current study involved 500 Japanese and 1,800 American participants who were married and employed at the time of data collection.ResultsResults from multigroup path models revealed cultural differences. The relational context—spousal support and strain—played moderating roles in the associations between work–family spillover and marital stability in both countries. However, distinct sociocultural patterns emerged as spousal strain showed a stronger association among Japanese participants, whereas spousal support was more prominent among Americans in relation to marital stability.ConclusionThe results support Gottman's contention that positive and negative features of marriage are related to marital stability directly and indirectly by shaping the impacts of work–family spillover and sociocultural expectations of work and family.ImplicationsPractitioners and organizations should recognize the role of spouses in addressing the negative effects of work–family spillover in marriage, as well as incorporating clients' or employees' cultural backgrounds when addressing marital concerns.