Background: Supernumerary kidneys are rare congenital renal anomaly, most of which are incidentally detected. These are distinguished from duplex kidneys due to presence of separate capsule and separate arterial supply to each kidney. Ultrasonography may detect this rare anomaly but may be insufficient in evaluation of renal vasculature and ureteric drainage due to bowel gases. Cross sectional imaging may better depict morphology of these kidneys and complications like calculi, hydro/pyonephrosis and even renal cancers that are associated with them. Case Report: We report a case having supernumerary kidney along with S-shaped fusion anomaly on left side, incidentally detected in a 50 years old woman. It was smaller in size than the native kidney, had a separate ureter and arterial supply. No calculi/hydronephrosis or malignancy was present in our case. Conclusion: Supernumerary kidney with S-shaped fusion anomaly is a rare congenital renal anomaly, associated with complications like calculi, infections, malignancies. It is also important to distinguish these from other congenital renal anomaly and precisely assess its vascular supply and urinary drainage in renal transplant patients.