According to the invention, there is provided a novel soybean variety designated XB22K05. This invention thus relates to the seeds of soybean variety XB22K05, to the plants of soybean XB22K05 to plant parts of soybean variety XB22K05 and to methods for producing a soybean plant produced by crossing plants of the soybean variety XB22K05 with another soybean plant, using XB22K05 as either the male or the female parent.