According to the invention, there is provided a novel soybean variety designated XB30Y08. This invention thus relates to the seeds of soybean variety XB30Y08, to the plants of soybean XB30Y08 to plant parts of soybean variety XB30Y08 and to methods for producing a soybean plant produced by crossing plants of the soybean variety XB30Y08 with another soybean plant, using XB30Y08 as either the male or the female parent.