Inbred corn line, designated KW6FQ1789, are disclosed. The invention relates to the seeds of inbred corn line KW6FQ1789, to the plants and plant parts of inbred corn line KW6FQ1789 and to methods for producing a corn plant, either inbred or hybrid, by crossing inbred corn line KW6FQ1789 with itself or another corn line. The invention also relates to products produced from the seeds, plants, or parts thereof, of inbred corn line KW6FQ1789 and/or of the hybrids produced using the inbred as a parent. The invention further relates to methods for producing a corn 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 corn lines derived from inbred corn line KW6FQ1789.