The article discusses the impact different concepts of solidarity can have on debates on models of consent for non-interventional research. It introduces three concepts of solidarity that have been referenced in bioethical debates: a purely descriptive concept, a concept that claims some derivative value for most but not all practices of solidarity, as well as a clearly normative concept where solidarity is tied to justice and taken to ground moral duties. It shows that regarding the rivalling models of study-specific consent, (...) tiered consent and broad consent, the first two concepts can be taken to favour tiered consent while only normative solidarity supports a model of broad consent—or an argument to allow non-interventional research without requiring consent at all. As normative solidarity is tied to considerations of justice, however, the argument appears less straightforward than one might expect: It presupposes that the research contributes to overcoming existing social injustices. (shrink)