Two cases of subdural abcess caused by frontal sinusitis are reported; One was a 44-year-old male and the other was a 22-year-old male. These two cases were successfully treated with neuro surgery. Computed tomography was found to be useful in detecting the intracranial lesions. We emphasize that the intracranial complications from sinusitis continue to be present even to day when antibiotics are available in different froms.