Increasing numbers of social movement scholars now advocate participatory and collaborative research approaches. These are often premised upon the assertion of a convergence between movement and researcher that implicates the latter in the struggles of the former. Naming this approach “solidarity research”, in this article I identify the components that provide the rationale for its pursuit. As well as affirming movement-researcher solidarity, this rationale also comprises a situated epistemology that asks academics to think reflexively about their research practice, the roles they play, and the interests they serve. This reveals the diverging positionality, of knowledge and interests, that often exists between movements and aca...