This article presents Heidegger’s little-known theory of the organism developed in his 1929/30 lecture The Fundamental Concepts of Metaphysics and interprets it as an antithesis to Kant’s theory of the organism contained in his Critique of Judgement (1790 and 1792/3). Heidegger drops Kant’s transcendental caveats in favour of a robust ontological understanding of organismic teleology. Moreover, Heidegger’s alternative approach draws attention to the fact that Kant’s notion of a ‘natural end’ (Naturzweck), by being tied to the idea of intelligent design, (...) still places the organism too close to the machine, notwithstanding assumptions of a ‘formative force’ (bildende Kraft) and ‘productive organs’ (hervorbringende Organe). Heidegger, in contrast, analyses organismic purposiveness in terms of an instinctual capacity (triebhafte Fähigkeit) in which an organism’s organs are ontologically grounded as its products, and which explains the specificity of an organism’s wholeness, motility and relation to the world. (shrink)