Ontological Difference

Ontological difference, in Žižek's Heideggerian-inflected usage across these two occurrences, names the irreducible gap between beings (ontic entities, positive determinate things) and Being itself—where Being is not another, higher entity but the very non-ontic horizon of meaning within which beings appear. As Žižek reads Heidegger, this difference is not a difference between two kinds of things; it is a primordial cleft that is prior to any ontic distinction and cannot be resolved by ascending to a third term or meta-level. Being just is this difference—the withdrawal, the opening, the spacing that allows entities to show up at all, yet itself shows up as nothing ontic.

Crucially, Žižek does not simply re-state the standard Heideggerian position. He presses ontological difference to its limit by contrasting Heidegger's version with Badiou's, where Being as pure multiplicity (set-theoretic void) makes a very different ontological cut than Heidegger's horizon of meaning. More radically, in the second occurrence (Sex and the Failed Absolute), Žižek identifies ontological difference with a "pure difference" or crack immanent to Being itself—a primordial ontological cleft that cannot be sutured by transcendental synthesis, scientific naturalism, or the neo-Kantian empirico-transcendental doublet. This move transforms ontological difference from a phenomenological-hermeneutic concept into something closer to a Lacanian Real: not a gap between the empirical and its condition of possibility, but a crack within Being as such, a negativity that Being itself "is."

Both occurrences belong to Žižek's major systematic works—slavoj-zizek-less-than-nothing-hegel-and-the-shadow-of-dialectical-materialism-v and slavoj-zizek-sex-and-the-failed-absolute-bloomsbury-academic-2019—where he is working out a materialist-dialectical ontology that passes through Heidegger in order to go beyond him toward Hegel and Lacan. In Less Than Nothing, ontological difference is introduced as the precise point where Heidegger and Badiou diverge: for Heidegger, Being is the non-ontic horizon of meaning; for Badiou, Being is pure inconsistent multiplicity (the void). For Žižek, neither fully captures what dialectical materialism requires—an internal negativity, a self-difference in Being.

This connects the concept to the cross-referenced canonicals in determinate ways. The concept is most directly an extension and radicalization of the Dialectics register: where Hegelian dialectics moves through Sublation (Aufhebung) to resolve opposition into a higher unity, ontological difference in Žižek's reading names a gap that resists exactly this sublation—a remainder that no synthetic elevation can absorb, aligning with the critiques of Aufhebung found across the corpus. It equally resonates with the Real: like the Lacanian Real, ontological difference is "what resists symbolisation absolutely," the crack that the Symbolic order cannot close. The link to Anxiety is also operative: anxiety in Lacan arises precisely where the gap that constitutes the subject risks being filled—a structural parallel to the ontological cleft that must not be sutured. Finally, the concept relates to Ereignis (Heidegger's "appropriating event"), which Žižek reads as Heidegger's own attempt to think the historicity of transcendental horizons without a super-subject—the move that, in Less Than Nothing, marks the deepest proximity between Heidegger and a materialist account of ontological difference.

Sex and the Failed AbsoluteSlavoj Žižek · 2019 (p.29)

Heidegger aimed at the same paradox with his 'ontological difference' which is not a difference between entities, not even the difference between beings and Being as different entities: Being is difference itself.

The quote is theoretically loaded because it collapses the standard two-term structure of ontological difference (beings / Being) into an identity: "Being is difference itself." This move transforms Being from a noun—a ground or horizon—into a verb-like pure negativity, making it structurally homologous to the Lacanian Real as "what does not cease not to be written" and to the Hegelian dialectical principle that negativity is not a property of things but the motor of reality as such. The phrase "not even the difference between beings and Being as different entities" explicitly forecloses the misreading of ontological difference as just another ontic distinction, insisting on its radically non-ontic, self-differentiating character.