Data, information and knowledge are core resources for policy, practice and activism in relation to health care and population health. However, they do not stand apart from the struggle for health equity. They are not simple representations of an objective reality, ‘out there’. They are produced in social practice and bear the imprint of power; they are embedded in languages which are framed by the experiences and aspirations of those who shape their use.  In this paper (here) I am working towards clearer understandings regarding the politics of data, information and knowledge in the struggle for health.