The Museum of World Culture (Världskulturmuseet) has been implementing some decolonial practicesin its indigenous collection. Therefore, the museum started migrating its collection to a new platform, and as partof this project, the museum needs to review its knowledge organization system, as some problems related to classi-fication and terminology were identified in the current database called Carlotta. The next step is to create a con-trolled vocabulary specific to the indigenous group, however, dealing with a sensitive collection requires identifying the ethical issues. Then, we question what ethical issues can be raised in organizing and representing Knowledge of Indigenous Collections in the Världskulturmuseet? This is a case study that employed an interview and content analysis of the Carlotta database. As a result, we point to the growth of research in the indigenous librarianship field. The museum uses inappropriate and obsolete terms to describe some of the collection objects. We conclude that indigenous self-determination in cultural institutions can guide the ethical issues related to the creation of a knowledge organization system in a museum.