A gamma correction digital-to-analog converter (DAC) includes a first DAC circuit, a second DAC circuit and a voltage generator. The first DAC circuit includes a plurality of first transistors and is configured to receive a plurality of first reference gamma voltages and 1 upper bits of k-bit digital data and generate a first gamma voltage based on the 1 upper bits of the k-bit digital data and the first reference gamma voltages. The second DAC circuit includes a plurality of second transistors and is configured to receive a plurality of second reference gamma voltages and m lower bits of the k-bit digital data and generate a second gamma voltage based on the m lower bits of the k-bit digital data and the second reference gamma voltages. The voltage generator is configured to generate a bulk voltage and supply the generated bulk voltage to a bulk terminal of each of the first transistors or supply the generated bulk voltage to a bulk terminal of each of the second transistors to generate a gamma correction analog signal according to the first gamma voltage and the second gamma voltage. A data driver including a gamma correction DAC and a method thereof are also introduced.