Marriage registration is not regulated in the provisions of Islamic law. Whereas in the present, marriage registration is an urgent need to protect the rights of a husband and wife. Then a further legal excavation was carried out taking into account the benefits in the sack. Legal excavation on the benefit of a case that is not supported by the text of the Koran and al-Hadith like this is then called mas}lah}ah al-mursalah. Marriage registration contains many benefits and can keep life between husband and wife from many difficulties. In addition, marriage registration has also been in line with the objectives of the Shari'a (maqa>s}id al-shari>’ah) which includes the maintenance of religion, life, descent, intellect and wealth. The benefit is the protection meant for the rights of the husband, wife and the status of the children they are born with. So that the application of the theory of mas} ah} al-mursalah in the recording of marriage is appropriate and fulfills the requirements. Because marriage registration is the result of extracting Islamic law through an appropriate method that meets the conditions of mas} lah} ah al-mursalah, the law of marriage registration based on a review of the theory of mas} lah} ah al-mursalah is mandatory for the people of Indonesia. The marriage registration contained in the statutory provisions must be interpreted as part of Islamic law itself.