An organic light emitting display device includes a semiconductor element, a lower electrode, a light emitting layer, an upper electrode, an anti-reflection layer, and a thin film encapsulation structure. The semiconductor element is disposed on a substrate. The lower electrode is disposed on the semiconductor element. The light emitting layer is disposed on the lower electrode. The upper electrode is disposed on the light emitting layer. The anti-reflection layer is disposed on the upper electrode. The thin film encapsulation structure is disposed on the anti-reflection layer.