A method for fabricating a thin film pattern and a method for fabricating a flat panel display device using the same to form an organic material pattern by not using a photo process are disclosed. The method for fabricating the thin film pattern includes forming a first conductive thin film pattern on a substrate; forming a master mold provided with a second thin film pattern; coating an organic material on the master mold provided with the second thin film pattern; joining the substrate and the master mold to contact the first thin film pattern and a surface of the substrate with the organic material; hardening the organic material; separating the substrate and the master mold from each other to provide an organic thin film pattern having step coverage formed by the second thin film pattern on a substrate provided with the first thin film pattern.