In a broad sense, the concept of social stigmatization (from the Greek word “stigma”, or sign) refers to the attitude of social disapproval and the negative reception of a specific group of people due to the characteristic features of this group. The problem of stigma affects many people, and it is also present in medicine and affects people with dementia. Social stigma of people with dementia is a worldwide problem. The severity of this phenomenon depends on several factors, including gender, age, level of education, religiosity, cultural differences, and the severity of cognitive disorders. Stigmatization can have numerous negative consequences. It leads to rejection, discrimination, and exclusion of stigmatized people from participation in various areas of social life. It also affects close relatives. The main goal of this review paper is to present the problem of stigma among people with dementia, discuss the results of represented research that deals with this issue, to approximate the elements that make up this process, and to present the negative consequences of stigma. Detailed knowledge of this phenomenon provides opportunity to reduce the extent of stigma and improve the quality of life people suffering from dementia. It is worth emphasizing the role of an individual approach to the patient and the need to educate the public about dementia.