According to the invention, there is provided a novel soybean variety designated XB15W06. This invention thus relates to the seeds of soybean variety XB15W06, to the plants of soybean XB15W06 to plant parts of soybean variety XB15W06 and to methods for producing a soybean plant produced by crossing plants of the soybean variety XB15W06 with another soybean plant, using XB15W06 as either the male or the female parent.