Presented study contains a review of Polish and global research focusing on the feeling of loneliness in intellectually disabled (ID) people. Research conducted in various ID groups: younger and older people, boys and girls, students in special and integrated classes, people living in special institutions and family homes has been carefully analyzed. The results of the analysis indicate the significance of these variables for the intensity of the feeling of loneliness in ID students and reveal a strong dependence between the feeling of loneliness and depression. The study provided directions for therapy concerning decrease of loneliness and depression in the intellectually disabled group.