Embodiments of the invention relate to an inbred corn line designated MZ-H003 that includes plants and seeds of inbred corn line MZ-H003. Methods for producing corn plants, such as inbred corn plants, hybrid corn plants, or other corn plants, as by crossing inbred corn line MZ-H003 with itself or any different corn plant are an integral part of these embodiments as are the resultant corn plants including the plant parts and seeds. Further embodiments relate to methods for producing MZ-H003-derived corn plants, to methods for producing male sterile MZ-H003 corn plants and to methods for regenerating such plants from tissue cultures of regenerable cells as well as the plants obtained therefrom. Methods for producing a corn plant containing in its genetic material one or more transgenes and to the transgenic corn plants produced by that method are also a part of embodiments disclosed herein.