This article describes emergency department (ED)-related adverse events in pediatric patients presenting to the ED at a pediatric hospital in Canada over a one-year period.  Among 1,319 patients at 3-months follow-up, 33 patients (2.5%) reported an adverse event related to their ED care.  The majority of these events (88%) were preventable. Most of the events involved diagnostic (45.5%) or management issues (51.5%) and resulted in symptoms lasting more than one day (72.7%).