According to the invention, there is provided a novel soybean variety, designated 93M40. This invention thus relates to the seeds of soybean variety 93M40, to the plants of soybean 93M40 to plant parts of soybean variety 93M40 and to methods for producing a soybean plant produced by crossing soybean variety 93M40 with another soybean plant, using 93M40 as either the male or the female parent. This invention also relates to methods for producing a soybean plant containing in its genetic material one or more transgenes and to the transgenic soybean plants and plant parts produced by those methods. This invention also relates to soybean varieties or breeding varieties and plant parts derived from soybean variety 93M40, to methods for producing other soybean varieties, lines or plant parts derived from soybean variety 93M40 and to the soybean plants, varieties, and their parts derived from use of those methods. This invention further relates to soybean seeds, plants, and plant parts produced by crossing the soybean variety 93M40 with another soybean variety preferably as part of a breeding program.