Background: Dementia can have a profound impact on decision making. People living with dementia (PLwD) often need to make decisions about health care, and, as dementia progresses, decisions may need to be made on their behalf. Specific interventions may support this process. Review Question: What interventions are effective in improving shared decision making or surrogate decision making on the health care of PLwD? Methods: A narrative systematic review of existing literature was conducted.