Introduction:Acuteappendicitis is the commonest cause of Acute Surgical abdomen.Appendicectomy is the most frequently performed urgent abdominal operation and is often the first major procedure performed by a surgeon in training. Aims&Objectives:The objectives of the study were-To study the relationship between hyperbilirubinemia and acute appendicitis and to evaluate its credibility as a diagnostic marker for acute appendicitis. Materials&Methods:The study was conducted in the Department of General Surgery, HKEs Basaveshwar Teaching and General Hospital, kalaburagi attached to MahadevappaRampure Medical College, kalaburagi during the period of August 2022 to August 2023. A one year cross sectional study. Results:A total of 100 patients with clinical diagnosis of acute appendicitis or appendicular perforation admitted in the Department of General surgery, HKEs Basaveshwar Teaching & General Hospital, kalaburagi attached to MahadevappaRampure Medical College, kalaburagi were studied. Discussion:Acute appendicitis is the most common cause of acute abdomen in young adults. Appendicectomy is the most frequently performed urgent abdominal operation and is often the ï¬ÂÂrst major procedure performed by a surgeon in training.PPAbout 8% of people in Westerncountries have appendicitis at some time in their lifetime. Conclusion: The present study suggests-Serum bilirubin levels appears to be a promising new laboratory marker for diagnosing acute appendicitis, however diagnosis of appendicitis remains essentially still - clinical. Its level come out tobe a credible aid in diagnosis of acute appendicitis and would be helpful investigation in decision making.