Objective: To investigate cognitive deficits in patients with primary Sjögren's syndrome (PSS). Method: Eighteen patients with PSS, aged between 25 and 61 years, were subjected to a short neuropsychological battery and compared with 18 patients with multiple sclerosis and 18 healthy controls. Results: The analysis of variance (ANOVA) revealed that the clinical groups had significantly worse performance than the control group on the Rey Auditory Verbal Learning Test 3; (F 2,53 =3.500, p=0.038) and 7 (F 2,53 =5.068, p=0.010). The clinical groups had elevated levels of depression on the Beck Depression Inventory (BDI); (p=0.003). The analysis of the data from the Trail Making Test B-A revealed a significant difference between the clinical and control groups (p=0.023). The analysis of covariance with BDI score as a covariate, did not change the outcome. Conclusion: Our study revealed cognitive deficits in patients with PSS detectable by a short neuropsychological battery.Keywords: neuropsychological evaluation; Sjögren's syndrome, cognitive impairment, neuropsychology. Primary Sjögren's syndrome (PSS) is an inflammatory autoimmune disease characterized by infiltration of exocrine glands. It occurs without an association with other connective tissue diseases and affects mainly salivary and lachrymal glands, causing xerostomy and keratoconjunctivitis sicca 1,2 . It often afflicts middle-age women, with an estimated prevalence of 2% in the adult population 3 . Moreover, PSS can be associated with impairments of the nervous system. In the central nervous system (CNS), the focal and nonfocal involvement of the brain and spinal cord has been described, resulting in a wide spectrum of neurological, psychiatric, and cognitive symptoms 4 .Cognitive impairments in patients with PSS were reported by Malinow 5 and later confirmed by other studies 6,7 . In Brazil, we have not found any case-series studies that have investigated cognitive impairments in PSS. We found one case report 8 .The results from other countries suggest that patients with PSS display cognitive impairments in attention, memory,