EU citizenship represents, without any doubt, a paradigmatic example of the extent to which rights can derive from a supranational form of membership, thus being considered as the first systematic proof for the reconfiguration of the classic model of citizenship. However, is the citizenship of the Union unique in its character or, on the contrary, do other international organizations also grant similar legal entitlements to the nationals of their member states? If so, what kind of rights do these IOs recognize at the supranational level, to whom and under which conditions? Going even further, to what extent different regional integration schemes shape, in practice, a new paradigm of rights-based supranational citizenship? Can we identify similar mechanisms of policy convergence in the propensity of IOs to deepen in highly sensitive areas of regional cooperation such as citizenship? Why do regional organizations create this supranational status of rights? Drawing on an original dataset including a large number of international organizations (N=83), this paper discusses the above-mentioned questions from a cross-regional perspective.