The essays collected in Interstitial Private Law encourage the next generation of private law theorists to engage with the 'connective tissue' of private law. Internationally prominent scholars introduce and analyze these crucially important interstitial aspects, including legal personhood, agency and other attribution rules, consent, estoppel, equity, remedies, and restitution. Contributions explain what interstitial concepts are and explore the ways they operate, contributing to the systematicity and functional coherence of private law systems.