According to the invention, there is provided a novel soybean variety designated XB05J08. This invention thus relates to the seeds of soybean variety XB05J08, to the plants of soybean XB05J08 to plant parts of soybean variety XB05J08 and to methods for producing a soybean plant produced by crossing plants of the soybean variety XB05J08 with another soybean plant, using XB05J08 as either the male or the female parent.