Marital stability is an essential factor in strengthening the family relationship, societal growth and sustainable national development. The institution of marriage is experiencing global instability, which is a threat to family life. Several factors have been identified as predictors of marital stability. While some have been empirically tested, some are mere theoretical postulations. Therefore, this study examined the extent to which psychological well-being predicts marital stability among women in Lagos State, Nigeria. The study employed a descriptive survey design. A total of 540 married female secondary school teachers and married female commercial bank workers were randomly selected for the study. Data was collected using questionnaire titles "Psychological Well-Being and Marital Stability Scales." One research question and two research hypotheses were raised. The research questions were answered using descriptive statistics while the hypotheses were tested at the p=0.05 level of significance, using inferential statistics. Simple linear regression analysis was used to test hypothesis one while independent sample t-test for hypothesis two. The results revealed a high prevalence of psychological well-being among women teachers and bankers and a significant influence of psychological well-being on marital stability (R=.184, R 2 =0.034, F=3.104, p=0.005. Furthermore, no significant difference was found in the marital stability of married female teachers and bankers. Based on the findings, recommendations were made. The study concluded that positive relations with others as an indicator of psychological well-being were positively related to marital stability. Also, participants' marital stability could be explained by different coping strategies, which the women in the two sub-sectors had devised to manage their work roles and family responsibilities.