Interfaith marriage is a marriage between a man and a woman who have different beliefs. Interfaith marriage is one of the events that often occurs in Indonesia, because Indonesia has a variety of races, tribes and religions. The impact arising from interfaith marriages is the problem of children's inheritance rights and the position of children from interfaith marriages. The results of this study according to the Civil Code children born from interfaith marriages have the right to become heirs and the position as a child is still recognized through civil relations with the mother while according to KHI children born from interfaith marriages are not entitled to inheritance rights unless the testator gives through grants or wills. This research uses normative legal research methods with a research approach in the form of legislation, the Civil Code (KUHPerdata) and the compilation of Islamic law (KHI).