According to the invention, there is provided a novel soybean variety designated XB34A05. This invention thus relates to the seeds of soybean variety XB34A05, to the plants of soybean XB34A05 to plant parts of soybean variety XB34A05 and to methods for producing a soybean plant produced by crossing plants of the soybean variety XB34A05 with another soybean plant, using XB34A05 as either the male or the female parent.