This report describes the case of two pediatric patients who demonstrated echocardiographic evidence of pulmonary hypertension (PH) during the acute phase of Kawasaki disease. The etiology of PH development in this setting is currently unknown, but the authors hypothesize that pulmonary vasculitis may play a significant role. Fortunately, the PH appeared to be self-limited and resolved in both cases with routine treatment of Kawasaki disease.