This article aims to formulate the concept of legal protection for productive land from the perspective of Lon Fuller’s theory of Legal structuralism. This doctrinal legal research (juridical normative) is descriptive-qualitative. It is a study to describe legal protection for productive land from conversion using an interactional approach or micro approach with qualitative analysis. The data were analyzed logically and systematically using qualitative methods. Land conversion occurs because of the growing land needs for housing, roads, and others The rapid land conversion can be disastrous for Indonesian citizens. The government through legal instruments and legal structures, namely regulations and apparatus, takes firm action against the perpetrators of land conversion. Lon Fuller’s legal structuralism theory is rarely put forward, especially in land conversion, so this perspective is novel.