According to the invention, there is provided a novel soybean variety designated XB13W08. This invention thus relates to the seeds of soybean variety XB13W08, to the plants of soybean XB13W08 to plant parts of soybean variety XB13W08 and to methods for producing a soybean plant produced by crossing plants of the soybean variety XB13W08 with another soybean plant, using XB13W08 as either the male or the female parent.