The sensing method for an organic light-emitting display comprises: defining a pixel group comprising a reference pixel and two or more valid pixels, among a plurality of pixels arranged on a horizontal line; obtaining a black level current sensing value by applying a black level data voltage to the reference pixel; obtaining a current sensing value for a given gray level by applying a data voltage for the given gray level higher than the black level to each of the valid pixels; and obtaining a pixel current sensing value by subtracting the black level current sensing value from the current sensing value for the given gray level to eliminate common noise.