Gartner’s duct cyst is an unusual vaginal cyst that develops from the Gartner’s duct, the residual embryonic structure of the caudal end of the mesonephric duct in females. Often discovered incidentally during routine pelvic exams on the anterior or lateral vaginal wall, these cysts typically exhibit no symptoms. Although the occurrence of Gartner’s duct cysts during pregnancy or at birth is exceedingly rare and has been scarcely documented in the literature, we encountered a pregnant patient who was referred to our hospital due to a protruding vaginal mass causing obstruction in the birth canal. Diagnosis was established through typical clinical examination and radiological findings, and after draining the Gartner’s duct cyst, a normal vaginal delivery was successfully performed.