Previous studies suggest that neurocognitive factors may contribute to the reduced social functioning of patients with schizophrenia. To assess this relationship, we administered a battery of neurocognitive tests and independently assessed symptoms (PANSS) and social functioning (SFS) in 88 stable outpatients with schizophrenia. We found a significant correlation between neurocognitive and social functioning variables. Patients' performance on aphasia, spatial organization and visual spatial tasks was correlated with their competence at activities of daily living, frequency of social activities and total social functioning. Regression analyses of each social functioning scale revealed different symptom and neurocognitive predictors. Patients' overall social functioning was best predicted by a combination of negative symptoms and aphasia. The results support the potential use of interventions to reduce patients' cognitive deficits as a means to improve their social outcomes.