Abstract : When someone dies, the inheritance process arises, and is regulated by inheritance law, inheritance law functions to regulate the transfer of a deceased person's assets to the heirs. Heirs according to the Civil Code are divided into two, namely, heirs ab intestato and testamenteir. Heirs ab intestato refer to blood and marriage relations, while heirs testamenteir refer to a person's will and can be shown to others outside of blood relations, including heirs testamenteir who are adopted children. Inheritance to adopted children through testament refers to Article 954 of the Civil Code. Testament is one of the legal means that ensures adopted children receive a share of inheritance rights from the testator's inheritance legally. The problem in this study is How to Resolve Disputes Against Adopted Children Who Receive Wills Related to Disputes Between Heirs According to Civil Law, and How is Legal Protection for Adopted Children Who Receive Wills Related to Disputes Between Heirs According to Civil Law. In this study, the researcher used the Legal Protection theory according to Satjipto Rahardjo and the Dispute Resolution Theory according to Dean G. Pruitt. The research method used in this study is a type of normative legal research, namely legal research with literature studies based on primary, secondary and tertiary legal sources. The research approaches used are the Legislation Approach, Conceptual Approach, Analytical Approach and Case Approach. The technique of collecting legal materials is carried out by identifying and inventorying positive legal rules, book literature, journals and other sources of legal materials. For the legal material analysis technique, it is carried out with grammatical interpretation, Systematic interpretation, Analogy Construction and legal refinement construction. The results of the study concluded that adopted children who were legally adopted through a court decision, and had no blood or marital relations, even though they did not receive a will from the testator, adopted children still had the same inheritance rights as legitimate children, legally adopted children became part of the heirs, ab intestato. Legal protection provides protection for human rights that are harmed by others and this protection is given to the community so that they can enjoy all the rights granted by law. The dispute between the adopted child and the heir was resolved by the problem solving, method through mediation, but no agreement was found, so the dispute was resolved by the contending method through the courts in order to maintain the inheritance rights of the adopted child.