The Lockean proviso is a feature of John Locke's labor theory of property which states that whilst individuals have a right to homestead private property from nature by working on it, they can do so only if "there was still enough, and as good left; and more than the yet unprovided could use".

The labor theory of property is a theory of natural law that holds that property originally comes about by the exertion of labor upon natural resources. The theory has been used to justify the homestead principle, which holds that one may gain whole permanent ownership of an unowned natural resource by performing an act of original appropriation.