The present invention discloses a gamma correction circuit and a display device, relates to the field of display technology, and solves the problem of display distortion of part of display panels due to changes in ideal gamma curves for part of batches of display panels of the same model. The gamma correction circuit provided by the embodiment of the present invention is used for performing gamma correction on the display panel, and comprises gamma registers and D/A converting units, wherein gamma voltages obtained by converting, by the D/A converting units, values in the gamma registers are used to form a test gamma curve, and the gamma correction circuit further comprises correction units used for correcting the values in the gamma registers, or correcting reference voltages of the D/A converting units, when a deviation exists between the test gamma curve and an idea gamma curve of the display panel.