this article aims to compare the legal standing of unregistered marriages children from different legal system, Islamic marriage law and residency law in Indonesia. Due the Act no. 1 /1974 and Islamic Law Compilation no. 1/1991 every unregistered marriages children can obtain legal status by pursuing a marriage decree (isbat nikah) or through the jurisprudence of a Constitutional Court Decision otherwise he does not have legal protection by the state because his parents’ marriage is not recognized and he cannot obtain birth certificates for children and other civil relations. On the contrary according to Regulation Of The Minister Of Internal Affairs Of The Republic Of Indonesia Number 9 Of 2016 About Accelerate Increasing Coverage Of Birth Certificate Ownership he can acquire the birth certificate by the letter of absolute liability (SPTJM)provided by the parents. From the maqashid sharia perspective this contradiction impact the legal standig of unregistered marriage children. This research is literary research with a comparative study with qualitative approach. In accordance with maqashid sharia every child must equal legal standing as resident without any discriminatory position since it is included in the area of basic necessity (mashlahat dharuriyat) as the origin of all rights relating to legal subjects