Plane of immanence (French: plan d'immanence) is a founding concept in the metaphysics or ontology of French philosopher Gilles Deleuze.

Immanence, meaning residing or becoming within, generally offers a relative opposition to transcendence, that which extends beyond or outside. Deleuze "refuses to see deviations, redundancies, destructions, cruelties or contingency as accidents that befall or lie outside life; life and death [are] aspects of desire or the plane of immanence." This plane is a pure immanence which is an unqualified immersion or embeddedness, an immanence which denies transcendence as a real distinction, Cartesian or otherwise. Pure immanence is thus often referred to as a pure plane, an infinite field or smooth space without substantial or constitutive division. In his final essay entitled Immanence: A Life, Deleuze wrote: "It is only when immanence is no longer immanence to anything other than itself that we can speak of a plane of immanence."