Endometriosis and its complications are not uncommon in Malaysian women. Two cases of ureteric obstruction due to endometriosis are reported and the literature on ureteric obstruction and endometriosis reviewed. It is emphasized that the possibility of ureteric obstruction must be suspected when there is extensive endometriotic disease or if the patient presents with loin pain or pain on one side of the abdomen. Ultrasound scan of the kidneys and, if necessary, an intravenous pyelogram will have to be done on the slightest suspicion. Patients with endometriosis will have to be followed up until the menopause or even later if they are on hormone replacement therapy.