This study replicates and expands previous research on the effects of religious homogamy and heterogamy on social values among American married Catholics. Merton (1957) indicated the importance of significant others - as linking group norms and values - for those who would be influenced by a group. Interactional effects of religiosity and marital context upon Catholics' social values such as social justice (welfare expenditures), racial relations (black/white relations), sexual permissiveness (attitudes toward premarital, extramarital, and homosexual relations), abortion (social and physical), and social tolerance (of printed material) are examined. Findings based on a Catholic sample from the NORC General Social Surveys confirm previous studies, i.e., that there is no difference between Catholics married to Catholics and Catholics married to non-Catholics regarding the relationship between religiosity and their social values.