According to the invention, there is provided a novel soybean variety designated XB15B07. This invention thus relates to the seeds of soybean variety XB15B07, to the plants of soybean XB15B07 to plant parts of soybean variety XB15B07 and to methods for producing a soybean plant produced by crossing plants of the soybean variety XB15B07 with another soybean plant, using XB15B07 as either the male or the female parent.