This dissertation addresses the role of welfare state/family care regimes, intersecting social locations and stress process factors in influencing the mental health and subjective well-being of informal caregivers of care recipients with age-related needs or disabilities within a European international context. Empirical analyses were conducted with secondary data from the 2012 and 2016 European Quality of Life Surveys. The study sample included informal caregivers (n=6,007) residing in seven different welfare state/family care regimes, including Denmark, Sweden, France, Germany, Italy, Greece and the United Kingdom. Ordinary least squares and ordered logit regression models revealed that welfare state/family care regime, social location (including both additive and interactive associations among gender, age group, marital status, and income), and stress process factors were independently associated with the mental health and life satisfaction of informal caregivers. Furthermore, there was some evidence to suggest that social location and stress process factors mediate some of the relationships between regime type and self-reported health and well-being and that stress process factors mediate relationships between social location factors and mental health and well-being. Overall, the results provide support for integrating welfare state/family care regime type and intersectionality factors into the SPM. Thus, future research on informal caregivers‘ mental health and well-being ought to incorporate such factors into their empirical analyses. The results also have some policy and practice implications. Residence in social democratic formal (Denmark), semi-formal (Sweden) and conservative formal (France) care regimes was the most beneficial to informal caregivers self-reported mental health. This was also the case for life satisfaction, except that residence in the liberal semi-formal (UK) was more beneficial than in the conservative formal (France) care regime. Mediating social location and stress process factors suggest that UK policy makers should address the greater social location disparities, greater role overload, and lack of coping resources that advantage Danish and Swedish informal caregivers compared to those residing in the UK. Lastly, policy makers from all the European countries assessed in the study should address the poorer mental health status of women and rural informal caregivers, those who experience role overload, secondary stressors, and lack coping resources. They should also address the the lower levels of formal education, more secondary stressors, and lack of coping resources associated with poorer subjective well-being. / Graduate