Obstructive sleep apnea syndrome (OSAS) is a disease characterized by repetitive upper airway obstructions during sleep and has an increasing importance because of its neurocognitive and cardiovascular sequel. Several epidemiological studies have revealed a strong association with stroke independent of known risk factors. In order to evaluate its importance as a predisposing factor; this preliminary study investigated the prevalence of OSAS in stroke patients. Twelve stroke patients; mean age 64.7 ± 14.3 years; included in the study. After polisomnographic evaluation, 8 patients (66.7%) with apneahipopnea index, over 5 are diagnosed as OSAS. It was concluded that OSAS is important as a predisposing factor in stroke.