A soybean variety designated 93B84, the plants and seeds of soybean variety 93B84, methods for producing a soybean plant produced by crossing the variety 93B84 with itself or with another soybean plant, and hybrid soybean seeds and plants produced by crossing the variety 93B84 with another soybean line or plant, and the creation of variants by mutagenesis or transformation of variety 93B84. This invention also relates to methods for producing other soybean varieties or breeding lines derived from soybean variety 93B84 and to soybean varieties or breeding lines produced by those methods.