Congenital neck masses usually present as superficial and painless masses, and they might be undetected until infected. Diagnosis could be done by physical examination and ultrasonography, but final diagnosis could be obtained by the histopathologic findings. We evaluated the 47 cases of the congenital neck masses, which were confirmed histopathologically in Asan Medical Center, retrospectively. The results were as follows ; 1) Among the 47 cases, thyroglossal'duct cyst was most common(31.9%), and branchial cleft anomaly(25.5%), cystic hygroma(21.3%), epidermoid cyst(14.9%) and hemangioma(6.4%) were in order. 2) There was no significant difference in sex distribution(male 46.8 % female 53.2%). 3) Congenital neck masses were mostly detected under 20 years of age(63.9%). 4) Congenital neck masses were located at midline(42.6%), anterior cervical triangle(44.7%) and posterior cervical triangle(12.8%). 5) The duration of symptom was mostly less than 1 year(53.2%).