To compare the changes in pulmonary function tests (PFT) after open and laparoscopic cholecystectomy, two groups of 25 patients were set up. Each patient had 3 PFTs performed and 2 PA grid chest roentgenograms taken. After taken into consideration the difference between PFT values were not significant (p less than or equal to 0.05). All PFT values decreased significantly on the first postoperative day (p less than or equal to 0.05). When PA chess roentgenograms were compared no clinically evident atelectasis except 1 lineary was seen in laparoscopic cholecystectomy group whereas 3 lineary, 4 focal, and 1 segmentary atelectasia were encountered in open cholecystectomy group (p less than or equal to 0.05). We believe that laparoscopic cholecystectomy has more advantages when speaking of postoperative PFT and atelectasia.