An inbred maize line, designated HHA612ND, is disclosed. The invention relates to the seeds of inbred maize line HHA612ND, to the plants of inbred maize line HHA612ND and to methods for producing a maize plant, either inbred or hybrid, by crossing the inbred line HHA612ND with itself or another maize line. The invention further relates to methods for producing a maize plant containing in its genetic material one or more transgenes and to the transgenic plants produced by that method and to methods for producing other inbred maize lines derived from the inbred HHA612ND.