The present technology relates to a data processing apparatus, a data processing method, and a program that are capable of generating calibration data for performing appropriate image processing. The data processing apparatus performs interpolation to generate calibration data for a predetermined focus position by using calibration data for a plurality of focus positions. The calibration data for the plurality of focus positions is generated from a calibration image captured at the plurality of focus positions. The calibration image is obtained by capturing an image of a known object in the plurality of focus positions with a multi-lens camera that captures an image from two or more viewpoints. The present technology is applicable, for example, to a multi-lens camera that captures an image from two or more viewpoints.