According to the invention, there is provided a novel soybean variety designated XB31H07. This invention thus relates to the seeds of soybean variety XB31H07, to the plants of soybean XB31H07 to plant parts of soybean variety XB31H07 and to methods for producing a soybean plant produced by crossing plants of the soybean variety XB31H07 with another soybean plant, using XB31H07 as either the male or the female parent.