An apparatus and method for tracking a gaze based on a camera array are provided. The apparatus may include a camera array including a plurality of cameras, and a plurality of light sources for the plurality of cameras, a light source controller to control the plurality of light sources so that the plurality of cameras capture a bright pupil image and a dark pupil image of a user, a detector to detect a position of a pupil center of the user, and a position of a glint caused by reflection of the plurality of light sources from the captured bright pupil image and the captured dark pupil image, and an estimator to estimate an interest position of eyes of the user by tracking a gaze direction of the eyes, based on the detected position of the pupil center and the detected position of the glint.