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CNS tumors are the second most common neoplasms in children and primary cause of childhood cancer morbidity. With the increase of 5-year survival rate, the diagnosis of long-term consequences is necessary. Recent studies suggest that childhood CNS tumors are associated with IQ decline and deficits in specific cognitive functions. Factors such as localization, age at diagnosis and therapeutic modalities influence the range and severity of the neuropsychological deficits. OBJECTIVE: This work presents the results of the first systematic evaluation of neuropsychological performance of Greek children with CNS tumors. METHODS: 72 children underwent neuropsychological testing between September 2015 and December 2017. Forty five children (29 boys, 64%) with mean age of 10.5 (range: 5.3-16.1) years were included in the study. Eighteen (40%) patients had low grade tumors. All patients underwent a comprehensive neuropsychological assessment, covering all domains of cognitive functioning. Impairment was defined as a performance of one standard deviation below the normative mean. RESULTS: Poor neurocognitive performance was found regarding attention (-2sd), speed of processing (-1.5sd), verbal memory (-2sd), learning (-1.5sd) and executive functions (-2sd). Despite the abovementioned deficits, intellectual efficiency was relatively preserved and fell within low average levels (>16%ile). CONCLUSIONS: Our results are in line with previous reports suggesting that children who have been treated for CNS tumors present with a wide range of long-term effects on cognitive functioning. Longer follow-up and expansion of the sample may give for further insights on the factors associated with poor neurocognitive outcome and allow appropriate intervention for optimal outcome.