A cotton cultivar, designated DP 579 BGII, is disclosed. The invention relates to the seeds of cotton cultivar DP 579 BGII, to the plants of cotton DP 579 BGII and to methods for producing a cotton plant produced by crossing the cultivar DP 579 BGII with itself or another cotton variety. The invention further relates to hybrid cotton seeds and plants produced by crossing the cultivar DP 579 BGII with another cotton cultivar.