The aim of this study was to analyze the influence of residential satisfaction and sense of belonging on loneliness in old age in two different contexts: the community and the residential care facility. We used two surveys of 1106 non-institutionalized and 234 institutionalized older adults, aged 60 years or more in Spain. Results from structural equation modeling and path analysis suggest that residential satisfaction would positively affect sense of belonging and would be negatively associated with loneliness in both residential environments, thus playing a protective role against the experience of loneliness.