Cotard syndrome, described in the history for presenting different types of delusions being the principal as the nihilistic delusion or delusion of negation, was reported on neuropsychiatric disorders. However, there is little literature that refers to it in the context of mental retardation. The aim of this report case is to explore the characteristics of Cotard syndrome. We present a 19 year-old boy who complete criteria for intellectual disability and Cotard syndorme. The literature was reviewed, finding succinct data associated to cases like this. We recommend to evaluate deeply the association between intellectual disability and Cotard syndrome and to research the treatment, given that there are no protocols in our region.