According to the invention, there is provided a novel soybean variety designated XB39N05. This invention thus relates to the seeds of soybean variety XB39N05, to the plants of soybean XB39N05 to plant parts of soybean variety XB39N05 and to methods for producing a soybean plant produced by crossing plants of the soybean variety XB39N05 with another soybean plant, using XB39N05 as either the male or the female parent.