Many sociological analyses of evidence-based policy frame it as contributing to the rationalisation of social relations, and being constructed through and implicated in systems of knowledge/power. These analyses are based on social theory placing insufficient emphasis on the emancipatory potential of evidence, and the possibility of rational adjudication of truth claims. We argue sociological engagement with evidence-based policy could be transformed by being informed by the work of Habermas. Habermas’ work could enable a more nuanced view of EBP in terms of whether or not this leads to rationalisation in the form of de-politicisation or marginalisation of citizens’ voices. Habermas’ work on knowledge-constitutive interests could inform a reconstructed view of evidence, disabused of positivist assumptions and with increased emancipatory potential. Habermas’ notion of the ideal speech situation as a procedural basis for truth could function as a standard for exploring how EBP is affected by power asymmetries, as well as for adjudicating truth claims.