We report a rare case of fetal adrenal cyst, diagnosed prenatally during routine ultrasound screening at 36 weeks' gestation. Serial ultrasonographic evaluations demonstrated a slight increase in the size of the cyst during pregnancy. A healthy female baby, weighing 2,810 g with Apgar scores of 8 and 9 at 1 and 5 minutes, respectively, was delivered vaginally at term. She underwent successful surgery at the age of 10 days. The postoperative course was smooth and the baby is currently doing well. Histology revealed an adrenal cyst.