Prior research has examined value antecedents to sustainable consumption, including religious or cultural values. We bridge together these usually separated bodies of literature to provide an ethically-based examination of both religious and cultural values in one model to understand what drives sustainable consumption as well as outcomes on consumer well-being. In doing so, we also fulfill calls for more research on socio-demographic antecedents to ethical consumption, particularly in the domain of sustainable consumption. We examine this relationship using data from the (...) religiously and culturally diverse country of Singapore, collected from a door-to-door, representative sample utilizing numerous quality control techniques. Our path analysis and logical follow-up tests reveal that both religious and cultural values influence sustainable consumption, and then sustainable consumption positively influences consumer well-being. Implications are provided for consumer ethics, business’ ethical practices, and belief congruence theory. (shrink)