A cotton cultivar, designated L-9009-6, is disclosed. The invention relates to the seeds of cotton cultivar L-9009-6, to the plants of cotton L-9009-6 and to methods for producing a cotton plant produced by crossing the cultivar L-9009-6 with itself or another cotton variety. The invention further relates to hybrid cotton seeds and plants produced by crossing the cultivar L-9009-6 with another cotton cultivar.