An organic light-emitting display apparatus includes a substrate; an active layer; a gate electrode, source and drain electrodes; a first insulating layer disposed between the active layer and the gate electrode; a second insulating layer disposed between the gate electrode and the source and drain electrodes; a third insulating layer disposed over the source and drain electrodes; conductive layers disposed over the third insulating layer and electrically connected to the source and drain electrodes through the third insulating layer; a first line disposed over the second insulating layer and formed of the same material as the source and drain electrodes; a second line overlapping the first line, disposed over the third insulating layer, and formed of the same material as the conductive layer; a fourth insulating layer disposed over the third insulating layer to cover the conductive layer; and an organic light-emitting diode disposed over the fourth insulating layer.