Kidney failure due to uterine prolapse is rare, nonetheless, early recognition and treatment of this form of postrenal kidney failure are essential in order to prevent serious complications.In this article we describe a 73-year-old woman and a 63-year-old-woman with severe kidney failure due to a uterine prolapse. Both patients were initially treated with a nephrostomy catheter to ensure the passage of urine from the kidneys, after which the uterus was repositioned using a vaginal ring.Renal failure due to uterine prolapse can be easily diagnosed by physical examination. If uterine prolapse is diagnosed in a patient with renal failure, it is essential to quickly ensure the passage of urine in order to secure the function of the kidney.