We performed pacemaker implantation with biventricular pacing using a usual dual-chamber pacemaker device in three children with complete atrioventricular block. The post-operative QRS durations were 114, 112, and 106 milliseconds in patients 1, 2, and 3, respectively. Post-operative echocardiography revealed well-synchronised left ventricles. Biventricular pacing in children with complete atrioventricular block may be useful for shortening the QRS duration.