Functional Endoscopic sinus surgery (FESS) is a minimally invasive surgical procedure that opens up the sinus air cells and the sinus ostia with an endoscope. The use of FESS as a sinus surgical method has now become widely accepted and the term functional is meant to distinguish this type of endoscopic surgery from the nonendoscopic more conventional sinus procedure. Functional Endoscopic sninus surgery is being done regularly at TU Teaching Hospital from 2003. Total number of cases done from March 2003 till December 2005 were 94. Maximum number of FESS was done for nasal polyps, which was carried out in 80 patients, out of which, FESS for ethmoidal polyp was done in 47 patients and for antrochoanal polyps in 33 patients. Other conditions where FESS was carried out were chronic maxillary sinusitis in 8 patients, fungal sinusitis in 5 patients, and endoscopic medial maxillectomy for inverted papilloma in 1 patient.