Objective: Malnutrition is associated with poor clinical outcomes in many diseases. The Controlling Nutritional Status (CONUT) is an objective index used for evaluating nutritional status of hospitalized patients. The aim of this study was to investigate the relationship between malnutrition assessed by CONUT score and the prognosis in patients undergoing carotid artery stenting (CAS). Methods: The study included 170 patients who underwent CAS due to symptomatic or asymptomatic severe carotid artery stenosis. Median follow-up period was 50 (interquartile range [IQR], 41-60) months. Patients were divided into two groups according to the CONUT score: (i) normal nutrition (<2) and (ii) malnutrition (≥2). Primary endpoint was accepted as MACE (major adverse cardiac events) including all-cause death and ischemic stroke. Results:The prevalence of MACE was significantly higher in the malnutrition group (p=0.001). Kaplan Meier analysis showed lower survival rates in the malnutrition group (log rank = 9.36, p=0.002; Figure 4). In multivariate logistic regression analysis, age and CONUT score were independent predictors of all-cause death and stroke after adjustment for confounding factors, respectively, (OR: 1.058, 95% CI: 1.013-1.105, p=0.011, OR: 1.318, 95% CI: 1.017-1.881, p=0.039). Conclusion: Higher CONUT scores were associated with adverse outcomes in patients with CAS. Malnutrition assessed by the CONUT score may provide valuable prognostic information in patients with CAS.