Type 2 diabetes has been linked with increased risk of dementia and cognitiveimpairment among older adults and with premature mortality in young and middleagedadults. Objective: This study aimed at examining the relation between type 2diabetes mellitus and cognitive dysfunctions.Subjects: This study was conducted on20 patients with type 2 diabetes of both sexes (15 males, 5 females) and twentyhealthy control subjects, matched for age, sex and educational level. Methods: Allpatients were assessed using clinical evaluation, CT brain and Psychometric tests(Mini-Mental Status Examination, Beck Depression Scale, Halstead Reitan test,Wechsler Adult Intelligence Scale and Wechsler memory scale (WMS). Results:Statistically significant lower results were found in group1 when compared to group2(p<0.05) in each of the following tests : Associative learning subtest of WechslerMemory, Similarity and digit symbol subtests of Wechsler Adult Intelligence Scale.The results of group1 in vocabulary subtest of Wechsler Adult Intelligence Scale werelower than those of group2. However, this difference did not reach statisticalsignificance (P>0.05). Conclusions: T2DM is a risk factor for cognitive impairmentas it affects learning, memory, verbal comprehension, sustained attention andpsychomotor speed.