Abstract To investigate the prevalence of monosymptomatic enuresis (ME) in children diagnosed with obstructive sleep apnea syndrome (OSAS) and the rate of resolution or improvement in enuresis following adenotonsillectomy. Materials and methods: We retrospectively reviewed the charts of 541 consecutive patients who underwent adenotonsillectomy for OSAS secondary to adenotonsillar hypertrophy between January 2005 and January 2009. All of the charts for patients between 5 and 18 years of age at the time of surgery (n = 398) were included in the study. After reviewing the charts, the families were contacted by telephone. Those patients who had shown preoperative symptoms of enuresis were questioned to determine whether there had been any change in their complaints postoperatively. Results: Of the 398 patients whose records were reviewed, 98 were excluded from this study because of incomplete records. The incidence of ME in the study group (n = 300) prior to adenotonsillectomy was 30.7% (