Gall bladder cancer is rmost common malignant lesion of the biliary tract and is the 5th most common malignancy of the gastrointestinal tract.Gall bladder cancer is an aggressive malignancy and carries an extremely poor prognosis except when incidentally diagnosed at an early stage after cholecystectomy for cholelithiasis. Gall bladder cancer is extremely variable by geographical region.Women appears to have a higher incidence across all geographical area. As the disease clinically resembles benign gallbladder disease, it is detected late in its course. MATERIALS AND METHODS All patients with chronic cholecystitis having gall stones diagnosed by ultrasonography, attending Department of Surgery, Rajendra Institute of Medical Sciences, Ranchi, during the period from April 2016 to October 2017 were selected and underwent cholecystectomy and biopsy of resected gall bladder done to find out incidental carcinoma. RESULTS – Findings were similar to that of chronic cholecystitis. CONCLUSION – Surgeon should have high index of suspicion for incidental carcinoma of gall bladder as there is no suggestive clinical, biochemical and radiological parameters for incidental gall bladder carcinoma