This article will explain the legality of Islamic law in the justice system in Indonesia. The importance of
this topic to be discussed is because judicial institutions in Indonesia are formed as a result of their
multiple historical developments. It was said that because until now in the Unitary State of the
Republic of Indonesia, several legal systems had various features, structures, and characteristics, namely;
the Islamic legal system, customary law system, and Western legal system. The problem that he explains
is related to the legality of Islamic law in the judicial system in Indonesia. To answer the questions
above, this article uses a qualitative research method with a library research model as a data collection
method. The search results found that there are several regulations that have been legalized so that they
become positive laws in Indonesia, namely: 1) the 1945 Constitution; 2) Law Number 17 of 1999
concerning the Implementation of Hajj; 3) Law Number 36 of 1999 concerning Management of
Zakat; 4) Law Number 41 of 2004 concerning Waqf; 5) Law Number 44 of 1999 concerning the
Implementation of the Specialties of the Aceh Region; 6) Law No. 3 of 2006 concerning Amendments
to Law No. 7 of 1989 concerning Religious Courts; 7) Law Number 1 of 1974 concerning Marriage.