<![CDATA[The complex interplay between citizenship laws and national agrarian regulations often creates uncertainty regarding land rights for the Indonesian diaspora. This study aims to analyze the legal implications of a change in citizenship status on land rights under the Basic Agrarian Law (UUPA) and Private International Law and to evaluate the effectiveness of postnuptial agreements as a legal instrument for protecting property assets in Indonesia. The findings indicate that transitioning from Indonesian citizenship to foreign citizenship results in the loss of legal capacity to hold *Hak Milik* (full ownership rights) over land in Indonesia. Article 21, paragraph (3) of the UUPA mandates the relinquishment of *Hak Milik* within a one-year timeframe to prevent land sovereignty from passing to foreign parties. Meanwhile, Constitutional Court Decision Number 69/PUU-XIII/2015 has created an avenue for diaspora members in mixed marriages to separate their assets through postnuptial agreements. However, the effectiveness of this mechanism is hindered by bureaucratic obstacles at Land Offices, ambiguities regarding retroactive applicability to existing assets and the potential for third-party disputes. The study concludes that there is a need for procedural unification and regulatory certainty to ensure that the protection of the diaspora's civil rights aligns with the spirit of national agrarian protection.]]>
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