According to the invention, there is provided a novel soybean variety designated XB38T05. This invention thus relates to the seeds of soybean variety XB38T05, to the plants of soybean XB38T05 to plant parts of soybean variety XB38T05 and to methods for producing a soybean plant produced by crossing plants of the soybean variety XB38T05 with another soybean plant, using XB38T05 as either the male or the female parent.