An organic light emitting display includes a scan driver configured to supply scan signals to scan lines and to supply emission control signals to emission control lines, a data driver configured to supply data signals and an initialization voltage to data lines, and pixels positioned at crossing regions of the scan lines and the data lines, each of the pixels comprising an organic light emitting diode (OLED) and a first transistor for controlling an amount of current supplied from a first power source and having a second electrode coupled to the first power source and a first electrode coupled to the OLED, wherein a gate electrode of the first transistor of a first pixel from among the pixels positioned on an ith (“i” is a positive integer) horizontal line is coupled to a corresponding one of the data lines via a second pixel from among the pixels positioned on an (i−1)th horizontal line in a period where the initialization voltage is supplied to the data lines.