Abstract This paper introduces Quantum Homeostasis as an interpretive framework for understanding quantum decoherence, superposition, and recoherence through the concept of boundary regulation. Rather than treating decoherence as wavefunction collapse triggered by observation, the framework recharacterises it as boundary saturation—the point at which a system can no longer sustain unresolved ambiguity within its regulatory capacity. Superposition is reframed as tolerated ambiguity: a condition in which multiple incompatible configurations coexist within stable boundary conditions. Recoherence is understood not as a return to a prior state but as recovery into a new homeostatic configuration. The framework draws disciplined structural comparisons across quantum, cognitive, and biological systems without asserting metaphysical equivalence between domains. No new physical formalism is proposed. The aim is interpretive clarification: to offer a process-level vocabulary that may help researchers think more precisely about how stability persists through ambiguity across scale. The paper explicitly identifies its own limits and non-claims. Keywords: quantum homeostasis, decoherence, boundary regulation, superposition, recoherence, process isomorphism, interpretive framework