Abstract: A novel soybean cultivar, designated 708990, is disclosed. The invention relates to the seeds of soybean cultivar 708990, to the plants of soybean 708990 and to methods for producing a soybean plant produced by crossing the cultivar 708990 with itself or another soybean variety. The invention further relates to hybrid soybean seeds and plants produced by crossing the cultivar 708990 with another soybean cultivar.