What does David Hume do with the dialogue form in Dialogues Concerning Natural Religion? I pursue this question in the context of a partial taxonomy of uses for dialogue in philosophy in general, and distinguish uses out of playfulness; for self-concealment; to tame opponents; for self-effacement; for causal operation; for self-discovery; and for dramatising a political ideal. I argue for Hume’s use of the last two, and investigate the expressions of selfhood and politics which these uses reveal in Dialogues Concerning Natural Religion: the self is multiple; sociable pleasure in company is more important than winning arguments or gaining knowledge. These performative readings of Dialogues reveal Hume as aiming to transform our individual and collective self-understanding and action, and propose a more political engagement with his thought generally.