An organic light emitting display apparatus includes a substrate, a thin film transistor formed on the substrate and comprising an active layer, a gate electrode, a source electrode, and a drain electrode, a first gate insulation layer arranged between the gate electrode and the active layer and including an opening portion, a first electrode arranged between the substrate and the first gate insulation layer to overlap the opening portion, an intermediate layer formed on the first electrode and including an organic light emitting layer, a second electrode formed on the intermediate layer, and a capacitor including a first capacitor electrode that is arranged between the substrate and the first gate insulation layer and a second capacitor electrode that is arranged on an upper surface of the first gate insulation layer.