Gallbladder duplication is a rare congenital anomaly, and the exact diagnosis of this pathology is important for preventing any clinical and surgical problems. Multidetector computed tomography (MDCT) and magnetic resonance cholangiopancreatography (MRCP) have increasing values in the diagnosis of gallbladder duplication. In this case report we present an evaluation and exact diagnosis of gallbladder duplication using ultrasound, MDCT and MRCP.