 In the decades since its original formulation by F. H. Bradley, “Bradley’s regress” has come to refer to a wider variety of arguments. This diversification has happened in two main directions: (i) with respect to the ontology that the argument targets; and (ii) with respect to the argument-type presented. (i) Bradley’s original arguments targeted a one-category ontology of qualities, where by “qualities” Bradley seemed to have in mind unrepeatable particularized properties or tropes. The same argument form, however, has been used against the one-category ontology of qualities conceived as multiply occurring universals, as well as against the two-category ontology of particulars and universals. In fact, one of the most commonly cited versions of Bradley’s regress in contemporary ontological debate challenges the possibility of appealing to relations to unify particulars (such as electrons, apples, chairs) with their respective property universals (negative charge, roundness, blackness). The argument aims to show that any appeal to a relation R (of instantiation, exemplification, etc.) to relate a particular a with its universal F will require a further relation R′ to relate the particular a, the universal F, and the relation R; and so on ad infinitum. (ii) In contemporary literature, “Bradley’s regress” has been associated with a number of arguments and problems that are not, in the way they are posed, strictly regress arguments. Some of these take the form of the general problem about unity, i.e., the question of what is the ontological ground of the unity of a bundle of tropes/state of affairs as opposed to the sum/list/set of their constituents. Others are after an explanation of how relations relate, i.e., the question of what it is about relations that makes them apt to relate distinct relata. Still others are after an explanation of the existence of specific unified complexes, i.e., the question of what makes it the case that a number of constituents of the right kinds are actually connected so as to form an existing fact/state of affairs/bundle of tropes.