What is the relation between norms (in the sense of 'socially accepted rules') and conventions? A number of philosophers have suggested that there is some kind of conceptual or constitutive relation between them. Some hold that conventions are or entail special kinds of norms (the 'conventions-as-norms thesis'). Others hold that at least some norms are or entail special kinds of conventions (the 'norms-as-conventions thesis'). We argue that both theses are false. Norms and conventions are crucially different conceptually and functionally in ways that make it the case that it is a serious mistake to try to assimilate them. They are crucially different conceptually in that whereas conventions are not normative and are behaviour dependent and ...