Mechanical and technical complications associated with a peritoneal dialysis catheter are seen frequently but inserting the catheter into the bladder is a rare complication. The Tenchkoff catheter was inserted into the bladder accidentally in a 64-year-old male patient and this complication was understood by the beginning of peritoneal dialysis (PD). This is the first case reported in the national literature. It is presented to highlight the importance of this complication that may be asymptomatic until the initiation of PD treatment.