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The paper presents a conceptual model for the disposition of state agricultural land. The model is made as an extension of the Croatian Land Administration Domain Model (LADM) country profile. The LADM 19152:2012 is an International Organization for Standardization (ISO) standard which provides a formal language to describe the basic information-related components of land administration. The aim of this research is to assess the possibility of using the LADM extension to efficiently manage state-owned agricultural land. Since more than half of state-owned agricultural land in Croatia is not activated, the priority is to increase usage and activate uncultivated agricultural land by users through disposition process. The disposition process is highly regulated and complex in procedures, and it poses difficulties for organizations in the implementation of disposition, so a model of successful management is necessary. The disposition process and the necessary steps are shown—mainly defined by legal regulations—and divided into two phases: the first phase is the development of the Program of Disposition of State-Owned Agricultural Land where the multi-criteria decision analysis (MCDA) for land potential analysis is crucial; the second phase is the realization of the disposition. In line with the disposition process, a Unified Modeling Language (UML) model for this LADM extension on the conceptual level was developed and is presented herein. Finally, the improvement of the agricultural land management system and the related processes are reviewed.