IntroductionThe cognitive discrepancy approach to loneliness is often used to describe loneliness in ageing populations, but to date, it has never been used to explore loneliness in older people with an intellectual disability. An analysis is needed utilising a refined list of causes of loneliness in this population. MethodUsing data from a nationally representative dataset of people aged over 40 with an intellectual disability (N = 708), this analysis runs repeated regressions of variables grouped into conceptual blocks, organised from sociodemographic to network quality. ResultsVariables selected predicted 23% of the loneliness variance. Functional limitations, education, working in the community, transport difficulties, pain, stress caused by service change, emotional health problems and confiding were all significant predictors of loneliness. ConclusionThat for those with fewer functional limitations only transport difficulties precipitated loneliness, suggests living a more independent life protects from loneliness, in this group. Those with functional limitations and who lead a more service dependent life appear more exposed to loneliness precipitating variables.