Hydatid disease of the urinary tract is seen rarely. Hydatiduria may be a finding of renal involvement, but it is a rare cause of renal colic. A case is reported of renal hydatid disease that was diagnosed during the investigation of renal colic. A 38-year-old woman presented with renal colic. She had a history of episodes of renal colic and occasional voiding of grape-like material. No calculus was found in the urinary tract by plain film or ultrasonographic examination. The histopathologic examination of this material revealed daughter cysts that are pathognomonic for hydatid disease. Ultrasound and computed tomography confirmed this diagnosis and right nephrectomy was performed without cyst perforation or any spilling of cyst content. Albendazole, 10 mg/kg per day, was given for 4 weeks (2 weeks preoperatively and 2 weeks postoperatively).