A congenital cystic mass was detected at the suprasternal notch of a seven-month-old male infant. After radiologic examinations including ultrasonography, computed tomography, and magnetic resonance imaging, the cyst was excised and diagnosed as a dermoid cyst. Dermoid cysts of the head and neck are rare lesions, but a midline location is characteristic for these congenital masses. To our knowledge, only two reports have been published, which were similar to our case in localization. Dermoid cysts should be included in the differential diagnosis of midline cysts.