 “Bradley’s Regress” is an umbrella term for a family of arguments that lie at the heart of the ontological debate concerning properties and relations. The original arguments were articulated by the British idealist philosopher F. H. Bradley, who, in his work Appearance and Reality (1893), outlined three distinct regress arguments against the relational unity of properties. Bradley argued that a particular thing (a lump of sugar) is nothing more than a bundle of qualities (whiteness, sweetness, and hardness) unified into a cohesive whole via a relation of some sort. But relations, for Bradley, were deeply problematic. Conceived as “independent” from their relata, they would themselves need further relations to relate them to the original relata, and so on ad infinitum. Conceived as “internal” to their relata, they would not relate qualities at all, and would also need further relations to relate them to qualities. From this, Bradley concluded that a relational unity of qualities is unattainable and, more generally, that relations are incoherent and should not be thought of as real.