Obstructive Sleep Apnea Syndrome (OSAS) is a common condition in children, and is characterized by intermittent partial or complete occlusion of the upper airway during sleep, leading to profound disturbances in homeostatic gas exchange, frequent arousals and disturbed sleep architecture. Pediatric OSAS is associated with a multitude of end-organ morbidities, most of which have been uncovered in the last decade. Of particular interest are the cardiovascular complications that may develop in children with OSAS, since they are posited to have not only an immediately significant impact on cardiovascular health during childhood, but may also affect cardiovascular outcomes later during adult life. In this review, we will present the specific cardiovascular complications that have thus far been described in children with OSAS, with reference to pertinent mechanisms, and potential implications.