A color registration apparatus and method capable of performing color registration without errors regardless of concentration of a developing agent is provided. The color registration apparatus determines a light emitting intensity irradiating onto a registration mark and a minimum light receiving intensity with which the registration mark is identified according to the concentration of the developing agent. The color registration apparatus includes a mark forming unit forming a concentration mark for each color and forming a registration mark for each color in response to a color registration control signal, a mark sensing unit sensing the concentration mark by emitting a plurality of first emitted lights comprising different intensities and sensing the registration mark by emitting second emitted lights, an examining unit comparing the intensities of first sensed lights with a predetermined reference value and generating the color registration control signal in response to the comparison results, a calculating unit that calculates the intensity of the second emitted light using the intensities of the plurality of first emitted lights and the intensities of the plurality of first sensed lights in condition that the intensities of second sensed light are greater than a predetermined value and a color registration unit performing color registration using the intensity of the second sensed light than a predetermined threshold value, wherein the first sensed light is a light reflected from the concentration mark, and the second sensed light reflected from the registration mark.